MB-100: revised mixed conf with multi buckets

Change-Id: I81f83f5a980a3f34a4b347d28f54cee2d04186e8
Reviewed-on: http://review.couchbase.org/24521
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>