## Description:
More fixes flagged by pylint 2 that don't hurt to have before the actual pylint 2 upgrade (which I'll submit soon).
## Checklist:
- [ ] The code change is tested and works locally.
- [x] Local tests pass with `tox`. **Your PR cannot be merged unless tests pass**
* Add mysensors device_tracker platform
* Add discovery of device_tracker platforms
* Enable discovery of device_tracker platforms that are not
DeviceScanner.
* Update signature of setup_scanner function in all affected platforms.
* Add test.
* Use discovery for mysensors device_tracker platform.
* Remove gps accuracy
* Small change to core like schema
* fix depency
Ville Skyttä
Fabian Affolter
William Scanlon
Martin Hjelmare