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/kubelet/util/pluginwatcher/plugin_watcher_test.go

@@ -27,6 +27,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
+	"k8s.io/klog"
 	registerapi "k8s.io/kubernetes/pkg/kubelet/apis/pluginregistration/v1alpha1"
 )
 
@@ -39,6 +40,7 @@ var (
 func init() {
 	var logLevel string
 
+	klog.InitFlags(flag.CommandLine)
 	flag.Set("alsologtostderr", fmt.Sprintf("%t", true))
 	flag.StringVar(&logLevel, "logLevel", "6", "test")
 	flag.Lookup("v").Value.Set(logLevel)