MB-100: revised hdgm case

Change-Id: I1f32147ab4a1c76f98b2b4a8026f2e3a6c2aa4cc
Reviewed-on: http://review.couchbase.org/27997
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>