* Use DataUpdateCoordinator for wemo
* Rename DeviceWrapper->DeviceCoordinator and make it a subclass of DataUpdateCoordinator
* Rename async_update_data->_async_update_data to override base class
* Rename: device -> coordinator
* Use a singleton for the Wemo registry and fan services
* Undo changes to the wemo subscription registry
* Use an entity service helper to register the Wemo fan services
* Fix Wemo fan test (missing ATTR_ENTITY_ID)
* Use the function name directly rather than a string
* Improve test coverage of the set_humidity service
* Add tests for the wemo component.
* Prefer mock tools from tests.async_mock over importing asynctest directly
* Avoid using `entity/entities` except when referring to an `Entity` instance in wemo tests
* Remove the overridden event_loop fixture from the wemo tests
* Patch the library code, not the integration code, in the wemo tests
Eric Severance