Allow stop/start home-assistant & flow of startup (#182)

* Allow config boot

* Read boot settings

* Use internal boot time for detect reboot

* Check if Home-Assistant need to watch

* Make datetime string and parse_datetime

* Add api calls

* fix lint p1

* Use new datetime parser for sessions and make a real default boot time

* fix lint p2

* only start docker if they is running

* convert to int (timestamp)

* add boot flag

hassio/dock/homeassistant.py

@@ -1,6 +1,8 @@
 """Init file for HassIO docker object."""
 import logging
 
+import docker
+
 from .interface import DockerInterface
 
 _LOGGER = logging.getLogger(__name__)
@@ -93,3 +95,19 @@ class DockerHomeAssistant(DockerInterface):
                     {'bind': '/ssl', 'mode': 'ro'},
             }
         )
+
+    def is_initialize(self):
+        """Return True if docker container exists."""
+        return self.loop.run_in_executor(None, self._is_initialize)
+
+    def _is_initialize(self):
+        """Return True if docker container exists.
+
+        Need run inside executor.
+        """
+        try:
+            self.docker.containers.get(self.name)
+        except docker.errors.DockerException:
+            return False
+
+        return True