refactor(router): pass socket to response constructor. (#1743)
refactor(router): pass socket to response constructor. (#1743)

Passing the socket from the request to the `IncomingMessage` is what
happens in native Node. Using a dummy `EventEmitter` then tacking the
socket onto the response later is kludge from historical tech-debt that
can now safely be cleaned up.
node-nock/nock