RFE: autogenerated notes from Koji commit changelog via CLI

[tim77]

Would be nice to autogenerate notes from Koji commit changelog via CLI:

fedpkg update --type enhancement --notes "AUTO_GENERATED_FROM_COMMIT_CHANGELOG" --stable-karma +3

would automatically include commit changelog history in new Bodhi update into AUTO_GENERATED_FROM_COMMIT_CHANGELOG.

This could simplify, automate and speedup update process and make maintainers life easier and spend less time on each update.

[mattiaverga]

Changing to "high trouble" because, when I tried to start working on that, I faced a lot of troubles I didn't thought before: what if the update is a multi-build update? What if the changelog overrun the notes characters limit? How to deal with updates supersede older updates and inherit their notes? How to deal updated edit?

Having faced a high pain when dealing with some of those problems in automatic updates, I know making this work for all updates will not be simple as I thought...