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

pkg/util/coverage/coverage.go

@@ -23,8 +23,8 @@ package coverage
 import (
 	"flag"
 	"fmt"
-	"github.com/golang/glog"
 	"k8s.io/apimachinery/pkg/util/wait"
+	"k8s.io/klog"
 	"os"
 	"testing"
 	"time"
@@ -86,6 +86,6 @@ func FlushCoverage() {
 	// This gets us atomic updates from the perspective of another process trying to access
 	// the file.
 	if err := os.Rename(tempCoveragePath(), coverageFile); err != nil {
-		glog.Errorf("Couldn't move coverage file from %s to %s", coverageFile, tempCoveragePath())
+		klog.Errorf("Couldn't move coverage file from %s to %s", coverageFile, tempCoveragePath())
 	}
 }