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/flexvolume/plugin-defaults.go

@@ -17,7 +17,7 @@ limitations under the License.
 package flexvolume
 
 import (
-	"github.com/golang/glog"
+	"k8s.io/klog"
 
 	"k8s.io/kubernetes/pkg/volume"
 )
@@ -29,6 +29,6 @@ func logPrefix(plugin *flexVolumePlugin) string {
 }
 
 func (plugin *pluginDefaults) GetVolumeName(spec *volume.Spec) (string, error) {
-	glog.Warning(logPrefix((*flexVolumePlugin)(plugin)), "using default GetVolumeName for volume ", spec.Name())
+	klog.Warning(logPrefix((*flexVolumePlugin)(plugin)), "using default GetVolumeName for volume ", spec.Name())
 	return spec.Name(), nil
 }