Async method for stopping connectivity with the emby server.

async def stop(self):
        """Async method for stopping connectivity with the emby server."""
        self._shutdown = True

        if self.wsck:
            _LOGGER.info('Closing Emby server websocket.')
            await self.wsck.close()
            self.wsck = None

        if self._own_loop:
            _LOGGER.info("Shutting down Emby server loop...")
            self._event_loop.call_soon_threadsafe(self._event_loop.stop)