* Add context
* Add context to switch/light services
* Test set_state API
* Lint
* Fix tests
* Do not include context yet in comparison
* Do not pass in loop
* Fix Z-Wave tests
* Add websocket test without user
## 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**