
Refactor `pkg/proxy/config`’s ServiceConfigHandler.OnUpdate and EndpointsConfigHandler.OnUpdate to different method names as they have different signatures. This will let the new proxy (https://github.com/GoogleCloudPlatform/kubernetes/issues/3760) implement both interfaces. Since we won’t need a separate loadbalancer structure (load balancing is handled in the proxy rules), we will simply handle both event types from the same object.