Move from glog to klog

- Move from the old github.com/golang/glog to k8s.io/klog
- klog as explicit InitFlags() so we add them as necessary
- we update the other repositories that we vendor that made a similar
change from glog to klog
  * github.com/kubernetes/repo-infra
  * k8s.io/gengo/
  * k8s.io/kube-openapi/
  * github.com/google/cadvisor
- Entirely remove all references to glog
- Fix some tests by explicit InitFlags in their init() methods

Change-Id: I92db545ff36fcec83afe98f550c9e630098b3135

cmd/kubeadm/kubeadm.go

@@ -20,10 +20,12 @@ import (
 	"fmt"
 	"os"
 
+	"k8s.io/klog"
 	"k8s.io/kubernetes/cmd/kubeadm/app"
 )
 
 func main() {
+	klog.InitFlags(nil)
 	if err := app.Run(); err != nil {
 		fmt.Fprintf(os.Stderr, "error: %v\n", err)
 		os.Exit(1)