Log the command line flags

With d7ddcca231, we lost the logging
of the flags. We should at least log what the command line flags
were used to start processes as those incredibly useful for trouble shooting.

cmd/kube-apiserver/app/server.go

@@ -91,6 +91,7 @@ import (
 	"k8s.io/kubernetes/pkg/version"
 	"k8s.io/kubernetes/plugin/pkg/auth/authenticator/token/bootstrap"
 
+	utilflag "k8s.io/kubernetes/pkg/util/flag"
 	_ "k8s.io/kubernetes/pkg/util/reflector/prometheus" // for reflector metric registration
 	_ "k8s.io/kubernetes/pkg/util/workqueue/prometheus" // for workqueue metric registration
 	"k8s.io/kubernetes/pkg/version/verflag"
@@ -110,6 +111,7 @@ others. The API Server services REST operations and provides the frontend to the
 cluster's shared state through which all other components interact.`,
 		Run: func(cmd *cobra.Command, args []string) {
 			verflag.PrintAndExitIfRequested()
+			utilflag.PrintFlags(cmd.Flags())
 
 			stopCh := server.SetupSignalHandler()
 			if err := Run(s, stopCh); err != nil {