MB-100: revised reb dgm cases

Change-Id: I4ac717dc7201e219a30e9d10708220e7b85b4d9d
Reviewed-on: http://review.couchbase.org/27801
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>