Prior to the Queens release, release notes were added to the kayobe
sphinx documentation. During the Queens release cycle they were changed
to be generated via the reno tool.
This change moves the pre-Queens release notes to the reno source,
ensuring that all release notes are available in one place.
Change-Id: I9606cbe50aacc498a645bff163e3d2dafac198e3
9dce0488ea