* See http://rfc.zeromq.org/spec:28/REQREP
* Not all testable statements are covered.
* At this point, there are several failures:
- test_spec_req: The REQ socket does not correctly discard messages
from peers that are not currently being talked to.
- test_spec_dealer/router: On disconnect, the queues seem to not be
emptied. The DEALER can still receive a message the disconnected
peer sent, the ROUTER can still send to the identity of the dis-
connected peer.
