Start streaming the console via telnet

def _start_console(self):
        """
        Start streaming the console via telnet
        """

        class InputStream:

            def __init__(self):
                self._data = b""

            def write(self, data):
                self._data += data

            @asyncio.coroutine
            def drain(self):
                if not self.ws.closed:
                    self.ws.send_bytes(self._data)
                self._data = b""

        output_stream = asyncio.StreamReader()
        input_stream = InputStream()

        telnet = AsyncioTelnetServer(reader=output_stream, writer=input_stream, echo=True)
        self._telnet_servers.append((yield from asyncio.start_server(telnet.run, self._manager.port_manager.console_host, self.console)))

        self._console_websocket = yield from self.manager.websocket_query("containers/{}/attach/ws?stream=1&stdin=1&stdout=1&stderr=1".format(self._cid))
        input_stream.ws = self._console_websocket

        output_stream.feed_data(self.name.encode() + b" console is now available... Press RETURN to get started.\r\n")

        asyncio.async(self._read_console_output(self._console_websocket, output_stream))