MB-100: capture master events for kv reb tests

Change-Id: Ifc31f646fc06d525592f3e8f08e7b25b8d9877eb
Reviewed-on: http://review.couchbase.org/24349
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>