CBQE-1766 add test for 3 balance zones and verify

Change-Id: If1dbdff334b53ee7c3c3de84a80297bfd1a71b51
Reviewed-on: http://review.couchbase.org/33305
Tested-by: Thuan Nguyen <soccon@gmail.com>
Reviewed-by: Thuan Nguyen <soccon@gmail.com>