add referencable filesystem types
add referencable filesystem types

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