raw image registration fails during mgmtclusterhost deployment

Created by: garloff

Deploying a new host for the k8s cluster management with make create should result in the specified k8s image (specified by kubernetes_version) to be downloaded and registered with openstack, if it's not already existent in this project. However, we typically end up with this image ending up in the queued state, but not active. Reported by Enrico Kern.