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/automation/test_time.py

@@ -9,7 +9,8 @@ import homeassistant.util.dt as dt_util
 import homeassistant.components.automation as automation
 
 from tests.common import (
-    fire_time_changed, get_test_home_assistant, assert_setup_component)
+    fire_time_changed, get_test_home_assistant, assert_setup_component,
+    mock_component)
 
 
 # pylint: disable=invalid-name
@@ -19,7 +20,7 @@ class TestAutomationTime(unittest.TestCase):
     def setUp(self):
         """Setup things to be run when tests are started."""
         self.hass = get_test_home_assistant()
-        self.hass.config.components.add('group')
+        mock_component(self.hass, 'group')
         self.calls = []
 
         @callback