ZMQ topics

Salt targeting is done using the zmq pub/sub mechanism. No filtering is done so all requests go to all minions. This is an attempt to make the requests more target-able. ZeroMQ supports filters on these sockets which are processed publisher side. So the thought is to set it to the minion id and a shared "broadcast" one. Only requests of tgt_type == list will use this. The thought is if we like this we can use other data (mine etc) to determine a more specific target on the master (such as a list) from a glob match etc.

Syndication masters do not have zmq filters applied, but will send out their syndicated requests with a filter as well. So all targeted messages aren't gauranteed to go to only the minion, its just best effort