Modify support for change_bucket > 10 for all test

Change-Id: I77069f7bb7be58e1060295ee95a2be5276ec7a45
Reviewed-on: http://review.couchbase.org/30452
Reviewed-by: Tommie McAfee <tommie@couchbase.com>
Tested-by: Ketaki Gangal <ketakigangal@gmail.com>