Remove partially-implemented "remove_gateways_from_volume()" method from syndicate.util.provisioning, since it has been obsoleted by remove_user_from_volume() in the SMI.
Remove partially-implemented "remove_gateways_from_volume()" method from syndicate.util.provisioning, since it has been obsoleted by remove_user_from_volume() in the SMI.

iychoi/syndicate,jcnelson/syndicate,jcnelson/syndicate,jcnelson/syndicate,jcnelson/syndicate,jcnelson/syndicate,jcnelson/syndicate,iychoi/syndicate,jcnelson/syndicate,iychoi/syndicate,iychoi/syndicate,iychoi/syndicate,iychoi/syndicate,iychoi/syndicate,jcnelson/syndicate,iychoi/syndicate