No authentication logging for transport API endpoints

[jw35]

The parking, aq and zone API endpoints are all implemented as class-based views inheriting from auth.AuthenticateddAPIView(). This in turn inherits from the standard APIView() to enforce authn/authz and extends the initial() method to log the path, user and token name for each authentication. This way we can tell who is doing what with the API.

But the Transport API either uses function-based views with decorators to enforce authn/authz, or class-based views based on generics.ListAPIView and generics.RetrieveAPIView with assignments to authentication_classes, permission_classes, etc. This works fine, but we don't get the logging.

I can't immediately see how to adapt what we have to include logging. @abrahammartin do you have any ideas?