generic FortiOS model to support new fortigate version and VM based products

[raunz]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

Closes issue #2227 by extending regex for clustered enviroment.
Introduces trial-and-error style for the new Fortigate VM based environments: FortiManager, FortiAnalyzer, FortiMail. The first succeeding command output will be appended to cfg.
Due to a bunch of new output variations in "get system status" the regex lines have multiple additions to keep the cfg stable. Similar regex improvements proposed in #2180 are also included in this PR.

Includes the same removal of "AV AI/ML Model" from "get system status" command as in pull request #2328

PS. FortiMail is the only FortiGate product which SSH daemon requires keyboard-interactive auth method in Oxidized config, all the other fortios devices are happy with auth_method "password".

[codecov-commenter]

Codecov Report

Merging #2373 (80b8632) into master (8179f48) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2373   +/-   ##
=======================================
  Coverage   62.59%   62.59%           
=======================================
  Files          30       30           
  Lines        1497     1497           
=======================================
  Hits          937      937           
  Misses        560      560           

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