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/volume/vsphere_volume/vsphere_volume_block.go

@@ -22,9 +22,9 @@ import (
 	"path/filepath"
 	"strings"
 
-	"github.com/golang/glog"
 	"k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/klog"
 	"k8s.io/kubernetes/pkg/util/mount"
 	kstrings "k8s.io/kubernetes/pkg/util/strings"
 	"k8s.io/kubernetes/pkg/volume"
@@ -40,10 +40,10 @@ func (plugin *vsphereVolumePlugin) ConstructBlockVolumeSpec(podUID types.UID, vo
 	blkUtil := volumepathhandler.NewBlockVolumePathHandler()
 	globalMapPathUUID, err := blkUtil.FindGlobalMapPathUUIDFromPod(pluginDir, mapPath, podUID)
 	if err != nil {
-		glog.Errorf("Failed to find GlobalMapPathUUID from Pod: %s with error: %+v", podUID, err)
+		klog.Errorf("Failed to find GlobalMapPathUUID from Pod: %s with error: %+v", podUID, err)
 		return nil, err
 	}
-	glog.V(5).Infof("globalMapPathUUID: %v", globalMapPathUUID)
+	klog.V(5).Infof("globalMapPathUUID: %v", globalMapPathUUID)
 	globalMapPath := filepath.Dir(globalMapPathUUID)
 	if len(globalMapPath) <= 1 {
 		return nil, fmt.Errorf("failed to get volume plugin information from globalMapPathUUID: %v", globalMapPathUUID)
@@ -88,7 +88,7 @@ func (plugin *vsphereVolumePlugin) NewBlockVolumeMapper(spec *volume.Spec, pod *
 func (plugin *vsphereVolumePlugin) newBlockVolumeMapperInternal(spec *volume.Spec, podUID types.UID, manager vdManager, mounter mount.Interface) (volume.BlockVolumeMapper, error) {
 	volumeSource, _, err := getVolumeSource(spec)
 	if err != nil {
-		glog.Errorf("Failed to get Volume source from volume Spec: %+v with error: %+v", *spec, err)
+		klog.Errorf("Failed to get Volume source from volume Spec: %+v with error: %+v", *spec, err)
 		return nil, err
 	}
 	volPath := volumeSource.VolumePath