Bootstrap / Component setup async (#6264)

* Bootstrap / Entiy setup async

* Cleanup add_job stuff / return task/future object

* Address paulus comments / part 1

* fix install pip

* Cleanup bootstrap / move config stuff to config.py

* Make demo async

* Further bootstrap improvement

* Address Martin's comments

* Fix initial tests

* Fix final tests

* Fix bug with prepare loader

* Remove no longer needed things

* Log error when invalid config

* More cleanup

* Cleanups platform events & fix lint

* Use a non blocking add_entities callback for platform

* Fix Autoamtion is setup befor entity is ready

* Better automation fix

* Address paulus comments

* Typo

* fix lint

* rename functions

* fix tests

* fix test

* change exceptions

* fix spell

tests/components/config/test_core.py

@@ -15,6 +15,9 @@ def test_validate_config_ok(hass, test_client):
     with patch.object(config, 'SECTIONS', ['core']):
         yield from async_setup_component(hass, 'config', {})
 
+    # yield from hass.async_block_till_done()
+    yield from asyncio.sleep(0.1, loop=hass.loop)
+
     hass.http.views[CheckConfigView.name].register(app.router)
     client = yield from test_client(app)