MB-25076: Add filter by permission for rbac/users
MB-25076: Add filter by permission for rbac/users

Example: /settings/rbac/users?permission=cluster.admin.security%21read
will return only those users who have the permission

Change-Id: I8ff2c04705e95d46274b163e282468f73838b986
Reviewed-on: http://review.couchbase.org/89161
Reviewed-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>
Tested-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>

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