* Use f-strings in integrations starting with "M"
* Format mqtt light init with black
* Fix lint error
* Fix pylint error
* Restore constants
* Update homeassistant/components/mqtt/discovery.py
* Update homeassistant/components/mqtt/discovery.py
* Update homeassistant/components/mqtt/discovery.py
* Update homeassistant/components/mqtt/discovery.py
* Format with Black
* Consolidate
* Fix tests
* Update imports
* Fix import
* Use importlib because integration and package share name
* Fix more tests
* Update .coveragerc and CODEOWNERS