CBQE-1659: add test permission user

Change-Id: If56126ab12a379a4138d35931f34d16cbb41aef1
Reviewed-on: http://review.couchbase.org/37451
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: buildbot <build@couchbase.com>