MB-100: fix pointer of ns_server/mb9209

Change-Id: I671bee60638cae19ca4ffdb091d83b0faa5d8267
Reviewed-on: http://review.couchbase.org/30245
Reviewed-by: Junyi Xie <junyi.couchbase@gmail.com>
Tested-by: Junyi Xie <junyi.couchbase@gmail.com>