CBQE-1698: add test for memcached -t

Change-Id: Ia7f607645e54d42d061ae3028357ea118f68622c
Reviewed-on: http://review.couchbase.org/39607
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: buildbot <build@couchbase.com>