MB-100: added read hhdgm case

Change-Id: I9f52c5ff382299b0b64c0a63875e77acda1d7ffa
Reviewed-on: http://review.couchbase.org/28124
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>