MB-16181: Add DCP callback for system events
MB-16181: Add DCP callback for system events

Add the function callback in memcached to enable
test and development of the DcpProducer in ep-engine

Change-Id: I2fe69f6a955d9481baa0f9ba404991462fcb9dd6
Reviewed-on: http://review.couchbase.org/73616
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Daniel Owen <b3fc0e1a51f252986e60be7da121b74d3ac6845f@couchbase.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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