Run unit tests for memcached validation

Change-Id: Icbdd2f45bebbf31405d0edf522afd4a3fa2e731f
Reviewed-on: http://review.couchbase.org/34426
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Reviewed-by: Eric Limare <eric.limare@couchbase.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>