move nfs 'block_device' out of volume
move nfs 'block_device' out of volume

libopenstorage/openstorage,pault84/openstorage,jvinod/ost,ModelRocket/openstorage,pault84/openstorage,pault84/openstorage,libopenstorage/openstorage,libopenstorage/openstorage,ModelRocket/openstorage,kunalkushwaha/openstorage