The cluster name is useful to identify resources created in different
k8s clusters, especially in the cloud environment, the cluster name is
always injected into the name of the cloud resources(e.g. the load
balancer, volume, etc.), which is helpful for the cluster resource
clean up.
The magnum cluster UUID is used as the value of '--cluster-name' option.
Story: 2004242
Task: 27766
Change-Id: I245a8869948a0b8bfa8d5cc32e7fb9277477026a
5d1eab9d9f