T6358: Container config option to enable host pid (backport #3472)

[mergify]

Change Summary

Container config option allow-host-pid to enable host pid

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

https://vyos.dev/T6358

Component(s) name

container

How to test

Create a container with option allow-host-pid which should add --pid host to the run commands.

set container name c02 allow-host-networks
set container name c02 allow-host-pid
set container name c02 image 'busybox:stable'

Smoketest result

vyos@vyos:~$ /usr/libexec/vyos/tests/smoke/cli/test_container.py
test_basic (__main__.TestContainer.test_basic) ... ok
test_dual_stack_network (__main__.TestContainer.test_dual_stack_network) ... 
IP address "192.0.2.1" can not be used for a container, reserved for the
container engine!

ok
test_ipv4_network (__main__.TestContainer.test_ipv4_network) ... 
IP address "192.0.2.1" can not be used for a container, reserved for the
container engine!

ok
test_ipv6_network (__main__.TestContainer.test_ipv6_network) ... 
IP address "2001:db8::1" can not be used for a container, reserved for
the container engine!

ok
test_uid_gid (__main__.TestContainer.test_uid_gid) ... 
Cannot set "gid" without "uid" for container

ok

----------------------------------------------------------------------
Ran 5 tests in 165.785s

OK

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

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This is an automatic backport of pull request #3472 done by [Mergify](https://mergify.com).