Fix automations listening to HOMEASSISTANT_START (#6936)

* Fire EVENT_HOMEASSISTANT_START automations off right away while starting

* Actually have core state be set to 'starting' during boot

* Fix correct start implementation

* Test and deprecate event automation platform on start

* Fix doc strings

* Remove shutting down exception

* More strict when to mark an instance as finished

* Add automation platform to listen for start/shutdown

* When we stop we should wait till it's all done

* Fix testing

* Fix async bugs in tests

* Only set UVLOOP when hass starts from CLI

* This hangs normal asyncio event loop

* Clean up Z-Wave node entity test

tests/components/binary_sensor/test_ffmpeg.py

@@ -65,7 +65,7 @@ class TestFFmpegNoiseSetup(object):
         entity = self.hass.states.get('binary_sensor.ffmpeg_noise')
         assert entity.state == 'off'
 
-        mock_ffmpeg.call_args[0][2](True)
+        self.hass.add_job(mock_ffmpeg.call_args[0][2], True)
         self.hass.block_till_done()
 
         entity = self.hass.states.get('binary_sensor.ffmpeg_noise')
@@ -130,7 +130,7 @@ class TestFFmpegMotionSetup(object):
         entity = self.hass.states.get('binary_sensor.ffmpeg_motion')
         assert entity.state == 'off'
 
-        mock_ffmpeg.call_args[0][2](True)
+        self.hass.add_job(mock_ffmpeg.call_args[0][2], True)
         self.hass.block_till_done()
 
         entity = self.hass.states.get('binary_sensor.ffmpeg_motion')