- clearing out the glance image builds, we download those from RDO
- cleaning out the underlay attachment, that should happen in the deployment
- no need to start the instack VM back up since the glance images are being downloaded

Change-Id: I82098c9e908d58a704ce8b183d902032dd056be5
Signed-off-by: Dan Radez <dradez@redhat.com>