We need to add new release notes files added for each commit. While we
can edit past release notes that's essentially the same as editing
history, it's fine for typos and/or clearing something up but when
adding new things we're adding onto notes in past releases. In the
case of 2 recently migrated clients the old release notes putting
patches that landed after 12.1.0 in the release notes for 12.1.0. This
commit fixes that issue and breaks that out into a new note.
Change-Id: Id7a24c1bc659c4e44b2214ec27e6b94ea742a81e
6e60a75184