MB-16333: Regression test for opcode 255.
MB-16333: Regression test for opcode 255.

Sends opcode 255 and validates is correctly rejected.

Change-Id: I8ac66cf5ebbabb65f707d6165f0775caf48d9f63
Reviewed-on: http://review.couchbase.org/55597
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

owendCB/memcached,owendCB/memcached,daverigby/memcached,couchbase/memcached,daverigby/kv_engine,daverigby/memcached,couchbase/memcached,daverigby/kv_engine,owendCB/memcached,daverigby/kv_engine,daverigby/memcached,owendCB/memcached,couchbase/memcached,couchbase/memcached,daverigby/kv_engine,daverigby/memcached