Finish all tasks before setup phase is done (#4606)

homeassistant/core.py

@@ -236,6 +236,12 @@ class HomeAssistant(object):
         """Track tasks so you can wait for all tasks to be done."""
         self.async_add_job = self._async_add_job_tracking
 
+    @asyncio.coroutine
+    def async_stop_track_tasks(self):
+        """Track tasks so you can wait for all tasks to be done."""
+        yield from self.async_block_till_done()
+        self.async_add_job = self._async_add_job
+
     @callback
     def async_run_job(self, target: Callable[..., None], *args: Any) -> None:
         """Run a job from within the event loop.