Support deploying Kubernetes cluster VNF which has a storage server
with Cinder volume. This feature enables users to deploy CNF which
has PersistentVolume on it. The following changes are added for
MgmtDriver.
1.Create a storage server VM with Cinder volume.
2.Expose Cinder volume as NFS shared directories in the storage
server.
3.Register NFS shared directories as Kubernetes PersistentVolumes.
4.Install NFS client on newly created Master/Worker VMs in all LCM
operations.
Implements: blueprint pv-k8s-cluster
Change-Id: Iaab9b6393e6f2007c637f83a82de0d27cf9db257
6929cbc3f1