fix slack-kube auth

1. reorder slack auth methods
2. refactor + fix kube slack lookup

app/doorboy-proxy.py

@@ -171,6 +171,8 @@ async def swipe(request):
     key = request.headers.get("KEY")
     data = request.json
     doors = set()
+
+    # this mapping also duplicated to slack.py
     if key == DOORBOY_SECRET_FLOOR:
         doors.update(["backdoor", "frontdoor", "grounddoor"])
     if key == DOORBOY_SECRET_WORKSHOP: