* Add and use speed constants
* Add and use meter based volume and area constants
* Add and use more mass unit constants
* Add and use concentration unit constants
* Add and use watts per square meter constant
* Use more time constants
* Use more data constants
* Add and use time related constants
* Sort time constants and reuse them in data rate constants
* Fix greeneyemonitor import
* Fix greeneyemonitor import V2
* Fix failing here_travel_time test
* Add TIME_MONTHS and TIME_YEARS
* Use TIME_MINUTES in opentherm_gw and isy994
* Add and use TIME_MILLISECONDS
* Change inconsistent ones
* Add TIME_MICROSECONDS and TIME_WEEKS
* Use constants in apcupsd and travisci
* Fix import error in upnp sensor.py
* Fix isy994 sensor.py using TIME_YEARS
* Fix dyson tests
* Use TIME_SECONDS in more places
* Use TIME_DAYS in google wifi
* use isort to sort imports for components starting with 'z'
* add skip to end of zha/core/channels/__init__.py
* put 'pylint: disable=import-error' at the right place
* remove the import of config_flow in zha/__init__.py
According to @balloob it is no longer needed.
* revert previous commit
* isort:skip homeassistant/components/zha/__init__.py completely
* Consolidate
* Fix tests
* Update imports
* Fix import
* Use importlib because integration and package share name
* Fix more tests
* Update .coveragerc and CODEOWNERS
