Just like I added Cinder volume upgrade testing before, let's
also test similarly for Nova and Neutron. :-)

More robust debugging and refactor included.

Related-Bug: #1941706
Depends-On: https://review.opendev.org/c/openstack/kolla-ansible/+/806476
Change-Id: Id79df44254603f9b37ce7da2bfc796fc0b1ac91f