make nfs driver create a unique volumeID
make nfs driver create a unique volumeID

pault84/openstorage,jvinod/ost,pault84/openstorage,portworx/openstorage,phoenix-io/openstorage,kunalkushwaha/openstorage,pault84/openstorage,libopenstorage/openstorage,libopenstorage/openstorage,ModelRocket/openstorage,ModelRocket/openstorage,libopenstorage/openstorage