MB-100: moved mrw confs to separate folder

Change-Id: I0d8b1e82ff92c525fae8e6fa6bd732d806d5da1a
Reviewed-on: http://review.couchbase.org/27894
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>