Make removal of missing service from the registry non-fatal #675

    await self.driver.async_stop()
  File "/usr/local/lib/python3.8/site-packages/pyhap/accessory_driver.py", line 358, in async_stop
    await self.advertiser.async_unregister_service(self.mdns_service_info)
  File "/usr/local/lib/python3.8/site-packages/zeroconf/aio.py", line 326, in async_unregister_service
    self.zeroconf.registry.remove(info)
  File "/usr/local/lib/python3.8/site-packages/zeroconf/_services/registry.py", line 58, in remove
    self._remove(infos)
  File "/usr/local/lib/python3.8/site-packages/zeroconf/_services/registry.py", line 109, in _remove
    old_service_info = self._services[info.key]
KeyError: 'driveway 1f912b._hap._tcp.local.'