Cleanup open channels and handlers

def _cleanup(self):
        """ Cleanup open channels and handlers """
        for channel in self._open_channels:
            try:
                self.disconnect_channel(channel)
            except Exception:  # pylint: disable=broad-except
                pass

        for handler in self._handlers.values():
            try:
                handler.tear_down()
            except Exception:  # pylint: disable=broad-except
                pass

        try:
            self.socket.close()
        except Exception:  # pylint: disable=broad-except
            self.logger.exception(
                "[%s:%s] _cleanup", self.fn or self.host, self.port)
        self._report_connection_status(
            ConnectionStatus(CONNECTION_STATUS_DISCONNECTED,
                             NetworkAddress(self.host, self.port)))
        self.connecting = True