feat(FreeBSD): add support

[alxwr]

PR progress checklist (to be filled in by reviewers)

• Changes to documentation are appropriate (or tick if not required)
• Changes to tests are appropriate (or tick if not required)
• Reviews completed

---

What type of PR is this?

This MR adds some minor adjustments to make this formula work on FreeBSD systems.

Primary type

• [build] Changes related to the build system
• [chore] Changes to the build process or auxiliary tools and libraries such as documentation generation
• [ci] Changes to the continuous integration configuration
• [feat] A new feature
• [fix] A bug fix
• [perf] A code change that improves performance
• [refactor] A code change that neither fixes a bug nor adds a feature
• [revert] A change used to revert a previous commit
• [style] Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc.)

Secondary type

• [docs] Documentation changes
• [test] Adding missing or correcting existing tests

Does this PR introduce a BREAKING CHANGE?

No.

Related issues and/or pull requests

Describe the changes you're proposing

• FreeBSD does not support grains.init. So this MR uses grains.get('init', 'unknown')
• FreeBSD's root group is wheel. The osfamilymap accounts for that now.
• FreeBSD's configuration directory for ports is /usr/local/etc/. The osfamilymap accounts for that now.

Pillar / config required to test the proposed changes

none needed

Debug log showing how the proposed changes work

Example with zero config on FreeBSD 13:

----------                                                                                                                                 
          ID: syslog_ng/package/install                                                                                                    
    Function: pkg.installed                                                                                                                
        Name: syslog-ng                                                                                                                    
      Result: True                                                                                                                         
     Comment: The following packages were installed/updated: syslog-ng                                                                     
     Started: 14:35:25.954231                                                                                                              
    Duration: 2019.921 ms                                                                                                                  
     Changes:                                                                                                                              
              ----------                                                                                                                   
              curl:                                                                                                                        
                  ----------                                                                                                               
                  new:                                                                                                                     
                      8.5.0                                                                                                                
                  old:                                                                                                                     
              e2fsprogs-libuuid:                                                                                                           
                  ----------                                                                                                               
                  new:                                                                                                                     
                      1.47.0                                                                                                               
                  old:                                                                                                                     
              glib:                                                                                                                        
                  ----------                                                                                                               
                  new:                                                                                                                     
                      2.78.3,2                                                                                                             
                  old:                                                                                                                     
              ivykis:                                                                                                                      
                  ----------                                                                                                               
                  new:                                                                                                                     
                      0.42.4                                                                                                               
                  old:                                                                                                                     
              syslog-ng:                                                                                                                   
                  ----------                                                                                                               
                  new:
                      4.4.0
                  old:
----------                                                                                                                                 
          ID: syslog_ng/config/install                                                                                                     
    Function: file.managed                                                                                                                 
        Name: /usr/local/etc/syslog-ng/syslog-ng.conf                                                                                      
      Result: True                                                                                                                         
     Comment: File /usr/local/etc/syslog-ng/syslog-ng.conf updated                                                                         
     Started: 14:42:39.125691                                                                                                              
    Duration: 161.943 ms                                                                                                                   
     Changes:                                                                                                                              
              ----------                                                                                                                   
              diff:                                                                                                                        
                  ---                                                                                                                      
                  +++                                                                                                                      
                  @@ -1,53 +1,11 @@                                                                                                        
                  -###############################################################################                                         
                  -# Modular syslog-ng configuration, with one log file per daemon or logpath                                              
                  -#                                                                                                                       
                  -# The log files are stored below /var/log/syslog/<daemon>.log                                                           
                  -# Log messages which aren't assosiated with a specifc logpath or daemon will be                                         
                  -# logged to the catch-all /var/log/messages log file.                                                                   
                  -#                                                                                                                       
                  -# Authors:                                                                                                              
                  -#  Christian Affolter <christian.affolter@stepping-stone.ch>                                                            
                  -#                                                                                                                       
                  +########################################################################                                                
                  +# File managed by Salt at <salt://syslog_ng/files/default/syslog-ng.conf>.                                              
                  +# Your changes will be overwritten.                                                                                     
                  +########################################################################                                                
                                                                                                                                           
                  -@version: 3.2                                                                                                           
                  -@include "scl.conf"                                                                                                     
                  +@version: 3.3                                                                                                           
                  +                                                                                                                        
                  +options {                                                                                                               
                  +};                                                                                                                      
                                                                                                                                           
                                                                                                                                           
                  -### Global and environmental variables ###                                                                              
                  -#                                                                                                                       
                  -# default filesystem log path
                  -@define log_base_dir "/var/log"
                  -@define syslog_dir "/var/log/syslog"
                  -
                  -# include base directory
                  -@define include_base_dir "/usr/local/etc/syslog-ng/syslog-ng.conf.d"
                  -
                  -
                  -### Options ###
                  -#
                  -# include all options definitions
                  -include "`include_base_dir`/option.d";
                  -
                  -
                  -### Sources ###
                  -#
                  -# include all log sources
                  -include "`include_base_dir`/source.d";
                  -
                  -
                  -### Filters ###
                  -#
                  -# include all common filters
                  -include "`include_base_dir`/filter.d";
                  -
                  -
                  -### Destinations ###
                  -#
                  -# include all common destinations
                  -include "`include_base_dir`/destination.d";
                  -
                  -
                  -### Log paths ###
                  -#
                  -# include all log destinations
                  -include "`include_base_dir`/log.d";
----------
          ID: syslog_ng/service/running
    Function: service.running
        Name: syslog-ng
      Result: True
     Comment: Service syslog-ng has been enabled, and is running
     Started: 14:42:39.289248
    Duration: 416.032 ms
     Changes:   
              ----------
              syslog-ng:
                  True

Summary for host
------------
Succeeded: 3 (changed=3)
Failed:    0
------------
Total states run:     3
Total run time: 651.525 ms

Documentation checklist

• Updated the README (e.g. Available states).
• Updated pillar.example.

Testing checklist

• Included in Kitchen (i.e. under state_top).
• Covered by new/existing tests (e.g. InSpec, Serverspec, etc.).
• Updated the relevant test pillar.

Additional context