D595 is a diff to run default_install test for the Cloud
'atomic installer' image. This is trivial, except that there's
an unfortunate issue with the image searching: we don't want
cloud boot images, but we can't really easily express that
without making the queries and config settings messier. That
didn't really seem like a great idea, so instead let's just
have a small hack: remove the cloud boot images from the
results after querying.
Adds a timer for the current stable post-release nightly.