remove deprecated modules netflow, fb_apache and azure

[kaisecheng]

Release notes

[rn:skip]

What does this PR do?

removed deprecated modules netflow, fb_apache and azure

Why is it important/What is the impact to the user?

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 (and/or docker env variables)
• I have added tests that prove my fix is effective or that my feature works

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Closes: Remove netflow, fb_apache, azure modules  #16357
• relates: add modules deprecation log for netflow, fb_apache and azure #16548

Use cases

Screenshots

Logs

[kaisecheng]

doc has instructions on using modules with netflow as example. The removal of doc will be addressed in another pr.

[yaauie]

TODO: companion PR for 8.x that emits an entry on the deprecation logger when either of these deprecated modules is activated.

Looking at the implementation, the best hook for this is likely LogStash::Modules::Scaffold#with_settings, which is only called when the plugin is being activated.

Or possibly by hard-coding a list of them in LogStash::Config::ModulesCommon::pipeline_configs to compare against its lvar specified_and_available_names.

[jsvd]

given we're not yet removing all modules, maybe we can lead the READMEs intact for now

[jsvd]

Other than maybe restoring the modules/README.md and x-pack/modules/README.md, LGTM

Follow up PRs:

1. 8.x deprecation entry when these modules are used
2. main cleanup docs related to netflow, fb_apache and azure modules

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: c39271d

Failed CI Steps

• :rspec: Ruby unit tests
• :rspec: Ruby unit tests
• 🥼 x-pack unit tests
• 🥼 x-pack unit tests

History

• 💚 Build #1602 succeeded ed55640
• 💔 Build #1599 failed d371bea
• 💛 Build #1591 was flaky 6a5e6f1
• 💔 Build #1583 failed c2f3ed8

cc @jsvd