* 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