Katello release process & release notes

[ekohl]

Right now the Katello release process instructs to create release notes:

theforeman-rel-eng/procedures/katello/release.md.erb

Line 33 in 3a147ad

- Using [redmine_release_notes](https://github.com/theforeman/foreman-documentation/blob/<%= foreman_version %>/guides/doc-Release_Notes/redmine_release_notes) script (see [README](https://github.com/theforeman/foreman-documentation/blob/<%= short_version %>/guides/doc-Release_Notes/README.md) as well): `./guides/doc-Release_Notes/redmine_release_notes katello <%= version %> > ./guides/doc-Release_Notes/topics/katello-<%= version %>.adoc`

Then it creates a PR with cherry picks:

theforeman-rel-eng/procedures/katello/release.md.erb

Lines 40 to 45 in 3a147ad

	- [ ] Open a PR (or use cherry-pick PR) against the release branch which updates `lib/katello/version.rb` to <%= full_version %>:
	- [ ] `git pull` to make sure you have the latest changes
	- [ ] `sed '/VERSION/ s/".\+"/"<%= full_version %>"/' lib/katello/version.rb`
	- [ ] Update/add the CHANGELOG.md file: `GITHUB_ACCESS_TOKEN=<secret> ./tools changelog configs/katello/<%= short_version %>.yaml`
	- [ ] Commit: `git commit -m "Release <%= full_version %>"`
	- [ ] Ensure that the commit above is the _last_ commit and there are no commits after it. This is the commit that will get tagged. (Rearrange commits with `git rebase -i` if needed.)

This means the Fixed in releases field in Redmine can't be correct at the time the release notes are made.

In Foreman this is not a problem because the cherry picks happen before and the release bit only bumps the version.

One solution is to move the release notes creation but another is to further align both processes. Katello could split the creation of cherry picks and the actual release in two.