* cleanup timer handle when device is removed
* separate unavailable times for mains vs battery
* better name
* remove light refresh handle when removing light
* remove unused parallel updates
* don't steal HA const for different purpose
* don't flood network every hour for lights
* update test to test both intervals
* add test for light refresh interval
* fix tests
* update test
* put parallel updates back for now...
* fix async_schedule_update_ha_state usage
* review comment
* review comment
* update test - review conversation
* review comments
* await count not call count
* flip some state
* Refactor zha core device _check_available().
Make it async, so we don't run it in a sync worker.
* Use random keep alive interval for zha device pings.
* Update tests.
David F. Mulcahey
Alexei Chetroi