Rename ServeWithListenerStopped to Serve in secure_serving
Rename ServeWithListenerStopped to Serve in secure_serving

This PR removes Serve function and uses all required places
ServeWithListenerStopped which takes place new Serve function.

This function returns ListenerStopped channel can be used to drain
requests before shutting down the server.

Kubernetes-commit: a8d2b3a7926394b1c53621804cdeb93e4a61b7c8

kubernetes/cloud-provider