enhance: add option to disable magic syslog RFC parsers

[LaurenceJJones]

ref: crowdsecurity/hub#940 (comment)

the syslog datasource RFC parsers cannot handle everything we want and its a chore to make a RFC compliant parser the one for now is good for 90% of cases but for those 10% it causes a roadblock.

This PR add the option to disable_rfc_parser to the syslog acquisition which simply allows to disable the magic parsers and simply remove the PRI (since our syslog or unifi parser does not handle PRI's) and send the log line as is.

We spoke about it ages ago @blotus 😅

[github-actions]

@LaurenceJJones: There are no 'kind' label on this PR. You need a 'kind' label to generate the release automatically.

• /kind feature
• /kind enhancement
• /kind refactoring
• /kind fix
• /kind chore
• /kind dependencies

Details

I am a bot created to help the crowdsecurity developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.

[github-actions]

@LaurenceJJones: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

I am a bot created to help the crowdsecurity developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.

[LaurenceJJones]

/kind enhancement
/area agent

[codecov]

Codecov Report

Attention: Patch coverage is 84.48276% with 9 lines in your changes missing coverage. Please review.

Project coverage is 56.66%. Comparing base (c5f5896) to head (975ba62).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/acquisition/modules/syslog/syslog.go	84.48%	6 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3435      +/-   ##
==========================================
+ Coverage   52.45%   56.66%   +4.21%     
==========================================
  Files         391      391              
  Lines       43549    43579      +30     
==========================================
+ Hits        22842    24694    +1852     
+ Misses      18693    16793    -1900     
- Partials     2014     2092      +78     

Flag	Coverage Δ
bats	40.96% <0.00%> (-0.06%)	⬇️
unit-linux	33.68% <84.48%> (?)
unit-windows	22.69% <77.58%> (+0.04%)	⬆️

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