CBQE-0 monitor DCP rebalance upgrade

Change-Id: I4970b841240a9cd6003c23f159dacc4fc48e9ef4
Reviewed-on: http://review.couchbase.org/40807
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>