MB-100: make toybuild to reproduce mb-8938

Change-Id: I900b5137a980bc330620e7221d604cbfea9ecab7
Reviewed-on: http://review.couchbase.org/28485
Reviewed-by: Junyi Xie <junyi.couchbase@gmail.com>
Tested-by: Junyi Xie <junyi.couchbase@gmail.com>