We have been using Loci images by default for quite some time.
They seem to be stable and images are published on
quay.io/airshipit.
Also the cleanup will encourage further improvements of Loci
which are not supposed to be necessarily backward compatible with
osh-images Openstack build jobs.
Change-Id: Ibe2cd0e6ae8b86334637f2a5ea1c71cae6b9381c
c82a78fcc1