src: unconsume stream fix in internal http impl

When emitting a 'connection' event on a httpServer, the function
connectionListener is called. Then, a new parser is created, and
'consume' method is called on the socket's externalStream. However,
if this stream was already consumed and unconsumed, the process
crashes with a cpp assert from the 'Consume' method in stream_base.h.
This commit makes sure that no SIGABRT will be raised and the process
will stay alive (after emitting the socket).

PR-URL: https://github.com/nodejs/node/pull/11015
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/_http_server.js

@@ -328,9 +328,11 @@ function connectionListener(socket) {
   // Override on to unconsume on `data`, `readable` listeners
   socket.on = socketOnWrap;
 
+  // We only consume the socket if it has never been consumed before.
   var external = socket._handle._externalStream;
-  if (external) {
+  if (!socket._handle._consumed && external) {
     parser._consumed = true;
+    socket._handle._consumed = true;
     parser.consume(external);
   }
   parser[kOnExecute] =