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/device_tracker/test_mqtt.py

@@ -43,7 +43,6 @@ class TestComponentsDeviceTrackerMQTT(unittest.TestCase):
 
             dev_id = 'paulus'
             topic = '/location/paulus'
-            self.hass.config.components = set(['mqtt', 'zone'])
             assert setup_component(self.hass, device_tracker.DOMAIN, {
                 device_tracker.DOMAIN: {
                     CONF_PLATFORM: 'mqtt',