MB-100: add 40M rebalance config with no ops

Change-Id: Ib65165e922c77d6bd66121ae77cfdcfd6c8388dc
Reviewed-on: http://review.couchbase.org/23842
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>