MB-9957: Add NRU to mutation packet

Change-Id: I0c1d2c67d1a8d03ec3609e742ad6b15eb718f411
Reviewed-on: http://review.couchbase.org/32690
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>