On mount failure, revert immutable flag from mount path only if we ascertained that it did not have the flag set to begin with.
On mount failure, revert immutable flag from mount path only if we ascertained that
it did not have the flag set to begin with.

libopenstorage/openstorage,pault84/openstorage,pault84/openstorage,libopenstorage/openstorage,libopenstorage/openstorage,pault84/openstorage