Make sure the upr mutation validator reflects the nru field

Change-Id: I7f9ff5c8df34105ebb007b3c39488b3c602af2b3
Reviewed-on: http://review.couchbase.org/33010
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>