CBQE-0: minor changes in rebalanceinout.py

Change-Id: I9d6e54773bb28ac7982d21b1bcec8c22ae3bba5a
Reviewed-on: http://review.couchbase.org/26852
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>