Adhoc Plugin Option to SOS Report Command

[MichaelThamm]

Imagine you want to rapidly iterate over your custom plugin features. You create the my-plugin.py file in the sos/report/plugins/ directory and run python3 setup.py install. You test the binary with sudo sos report --only-plugins my-plugin only to find out that you made a mistake in your code and need to redo this entire process again. Dramatic, I know.

Now imagine you are trying to distribute a sosreport solution to a large amount of teams that will consume sosreport and will want to maintain multiple custom plugin.py files that can be added to the plugins dir and then built on each iteration.

Proposal: A CLI option for sos report --add-plugin my-plugin.py
Purpose: Save time for better UX and more suitable for CI

[MichaelThamm]

Closing in favour of sos_extras plugin, works great thanks!