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/helpers/test_entity_component.py

@@ -272,6 +272,7 @@ class TestHelpersEntityComponent(unittest.TestCase):
             }
         })
 
+        self.hass.block_till_done()
         assert component_setup.called
         assert platform_setup.called
 
@@ -294,6 +295,7 @@ class TestHelpersEntityComponent(unittest.TestCase):
             ("{} 3".format(DOMAIN), {'platform': 'mod2'}),
         ]))
 
+        self.hass.block_till_done()
         assert platform1_setup.called
         assert platform2_setup.called
 
@@ -336,6 +338,7 @@ class TestHelpersEntityComponent(unittest.TestCase):
             }
         })
 
+        self.hass.block_till_done()
         assert mock_track.called
         assert timedelta(seconds=30) == mock_track.call_args[0][2]
 
@@ -360,6 +363,7 @@ class TestHelpersEntityComponent(unittest.TestCase):
             }
         })
 
+        self.hass.block_till_done()
         assert mock_track.called
         assert timedelta(seconds=30) == mock_track.call_args[0][2]
 
@@ -385,6 +389,8 @@ class TestHelpersEntityComponent(unittest.TestCase):
             }
         })
 
+        self.hass.block_till_done()
+
         assert sorted(self.hass.states.entity_ids()) == \
             ['test_domain.yummy_beer', 'test_domain.yummy_unnamed_device']