make users_storage versions available on ns_couchdb node
make users_storage versions available on ns_couchdb node

Change-Id: I368c4221edf4ee54ec5c8fef8c44096c28b2bf95
Reviewed-on: http://review.couchbase.org/78283
Tested-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server