MB-100: read dgm confs

Change-Id: I0f64ba2b2c28bc6a908aeec073dc5349cafc3b2f
Reviewed-on: http://review.couchbase.org/27753
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>