Make the Syslog input GA

[faec]

What does this PR do?

Remove the beta warning from syslog RFC 5424 in the code and docs.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

[elasticmachine]

Pinging @elastic/agent (Team:Agent)

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b syslog upstream/syslog
git merge upstream/master
git push upstream syslog

[ph]

@faec good finding in the unix's socket's status, I don't know if it should still be in beta. @andrewstucki or @andrewkroh is the unix socket still a beta feature or we could remove the warning? see https://github.com/elastic/beats/blob/master/filebeat/input/syslog/config.go#L122

[andrewkroh]

We might as well move the unix socket to GA too. I'm not aware of any reasons to hold it back from GA.

[elasticmachine]

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• Build Cause: Pull request #26293 updated

• Start Time: 2021-06-15T19:14:31.861+0000

• Duration: 100 min 50 sec

• Commit: 8ec0d57

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Passed	14052
Skipped	2292
Total	16344

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Skipped	2292
Total	16344

[ph]

Syslog changes LGTM, is there a reason why the modules files was updated?
@faec did you look into the documentation to make sure we removed any beta mention?

[faec]

I'm not sure why the modules file updated -- it was an effect of make update, but it also seems to be breaking the CI, so maybe there are still module glitches left, I will double check my go setup.

I searched the documentation and removed all the beta warnings I could find. I also removed them from the reference configs, but edited the generated files by mistake, so make update removed the changes -- I have fixed that now.

[faec]

Module problem was seemingly because my local go was pointing at 1.16.4 instead of 1.16.5 when I ran make update -- hopefully fixed now.