Optimization: Return Complete immediately for transmit()
Optimization: Return Complete immediately for transmit()

Instead of returning Incomplete and have the caller call
transmit() a second time to get Complete.

Change-Id: If7f94efca28d7c2211a7186a31b92ea13deab4c2
Reviewed-on: http://review.couchbase.org/57034
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

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