Automatic merge from submit-queue

Add kubectl describe cmd support for vSphere volume

This PR does following,
Add kubectl describe cmd support for vSphere volume

Examples:

> kubectl describe pod redis
.......
Volumes:
  vmdk-storage:
    Type:	vSphereVolume (a Persistent Disk resource in vSphere)
    VolumePath:	[Datastore] test1
    FSType:	ext4
.........

> kubectl describe pv pv0001
Name:		pv0001
Labels:		<none>
Status:		Available
Claim:
Reclaim Policy:	Recycle
Access Modes:	RWO
Capacity:	2Gi
Message:
Source:
    Type:	vSphereVolume (a Persistent Disk resource in vSphere)
    VolumePath:	[vsanDatastore] volumes/test11
    FSType:	ext4
No events.