message: fix stream status after adding external input success
  Stream status was not set to PUBLISHER_READY causing erizo controller
  not include the stream on stream list after room connection success.
diff: @@ -540,6 +540,7 @@ var listen = function () {
  video: options.video,
  data: options.data,
  attributes: options.attributes});
  + st.status = PUBLISHER_READY;
  socket.streams.push(id);
  socket.room.streams[id] = st;
  callback(id);
  