* Adds tests for pi_hole integration
* Refactor pi_hole component to an integration supporting multiple platforms
* Adds mock of Hole dependency
* Aborts platform setup when discovery_info is none
* Removes use of monitored_conditions
* Adds integration setup test
* Removes PlatformNotReady check
* Adds sensor test
* Code review updates
* Refactor tests to assert state through hass
* Reorder imports
