Revert "http: always emit close on req and res"

This reverts commit 8029a24.

Author: targos

lib/_http_server.js

@@ -561,8 +561,6 @@ function resOnFinish(req, res, socket, state, server) {
     req._dump();
 
   res.detachSocket(socket);
-  req.emit('close');
-  res.emit('close');
 
   if (res._last) {
     if (typeof socket.destroySoon === 'function') {