Sorry on the qemu front, but I was under the impression that bodhi
obsoleting old updates when a new version is submitted. Am I wrong, or is
something busted on the bodhi side?
See the bug. The downgrades happened when old updates were submitted for stable, either by
the packager submitting them or by getting enough karma to be submitted automatically.
Bodhi does not obsolete old updates, and until that's fixed, packagers will probably
have to obsolete them manually.