Use name for container registry
Use name for container registry

For Docker/Podman using an IPv6 address in a docker reference
is invalid. A name must be used:
      https://github.com/containers/libpod/issues/3516

Use the undercloud hostname on the ctlplane network.
<shortname>.ctlplane.<domain> for local container registry.

Related-Bug: #1836578
Depends-On: I23b8ca6a3f481781d9d91e1a5d83ab1311a272e2
Change-Id: Iec0f4f8279e5628dcb867312504acdc4fafc8152

openstack/python-tripleoclient