Rbd-provisioner images are not backed up on a DC central w/o Ceph
even when they are added to additional_local_registry_images.
This means that on restore of DC central they are no longer present
in registry.local. This causes subclouds with Ceph enabled to fail
restore (or apply) as they pull rbd-provisioner from central.
This commit fixes this.
Change-Id: I12310f694db6b53881646d1a3ee61b2a6f833d1b
Closes-Bug: 1896272
Signed-off-by: Ovidiu Poncea <ovidiu.poncea@windriver.com>