CBD-675: add rebalance out config with no ops

Change-Id: I6bea29d9d26f1d5c9e2ab70ed202c22c9742ccb3
Reviewed-on: http://review.couchbase.org/23811
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>