Homekit component cleanup (#17627)

* hass.async_add_executor_job
* Fix accessories.run -> async_track_state_change
* Fixed media_player test
* Flags are now local vars
* consistent use of " and '

homeassistant/components/homekit/util.py

@@ -104,7 +104,7 @@ def validate_media_player_features(state, feature_list):
             error_list.append(feature)
 
     if error_list:
-        _LOGGER.error("%s does not support features: %s",
+        _LOGGER.error('%s does not support features: %s',
                       state.entity_id, error_list)
         return False
     return True