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
The magnum cluster UUID is used as the value of '--cluster-name' option.
(cherry picked from commit 5d1eab9d9f896f6adf5a31a17c43995377a93f78)