Shutdown hang (#11793)

* intentionally handle queues during shutdown and carefully manage shutdown order

* more carefully manage shutdown to avoid threadlocks

* use debug for signal logging

* ensure disabled cameras dont break shutdown

* typo

frigate/util/services.py

@@ -33,7 +33,7 @@ def restart_frigate():
         proc.terminate()
     # otherwise, just try and exit frigate
     else:
-        os.kill(os.getpid(), signal.SIGTERM)
+        os.kill(os.getpid(), signal.SIGINT)
 
 
 def print_stack(sig, frame):