fix false positive forti detection, add fortiweb and fortianalyzer

[bretfourbe]

Fix false positive forti detection using content-type check for ssl-vpn
Add fortiweb and fortianalyzer detection

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 79.62%. Comparing base (8ad4671) to head (1c8ddd3).

Files	Patch %	Lines
wapitiCore/attack/network_devices/mod_forti.py	88.88%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #593      +/-   ##
==========================================
- Coverage   79.62%   79.62%   -0.01%     
==========================================
  Files         120      120              
  Lines       10102    10120      +18     
==========================================
+ Hits         8044     8058      +14     
- Misses       2058     2062       +4     

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