When using an Ubuntu Xenial host, this patch adds the Ubuntu
Cloud Archive Queens repository so that the MNAIO tooling
makes use of libvirt v4. This provides access to a better
snapshot and snapshot-revert implementation, among other
features.
To improve the chances of success during builds, retries
are added to the package install tasks. Also, given that
we're using Ansible > 2.1.x, we forgo the with_items loop
for the package installs and just give the package module
the list so that it installs them all at once.
Change-Id: I0373e29fb996de1538465277760a0181289cbb44
9b5f494753