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/credentialprovider/plugins.go

@@ -21,7 +21,7 @@ import (
 	"sort"
 	"sync"
 
-	"github.com/golang/glog"
+	"k8s.io/klog"
 )
 
 // All registered credential providers.
@@ -38,9 +38,9 @@ func RegisterCredentialProvider(name string, provider DockerConfigProvider) {
 	defer providersMutex.Unlock()
 	_, found := providers[name]
 	if found {
-		glog.Fatalf("Credential provider %q was registered twice", name)
+		klog.Fatalf("Credential provider %q was registered twice", name)
 	}
-	glog.V(4).Infof("Registered credential provider %q", name)
+	klog.V(4).Infof("Registered credential provider %q", name)
 	providers[name] = provider
 }
 
@@ -61,7 +61,7 @@ func NewDockerKeyring() DockerKeyring {
 	for _, key := range stringKeys {
 		provider := providers[key]
 		if provider.Enabled() {
-			glog.V(4).Infof("Registering credential provider: %v", key)
+			klog.V(4).Infof("Registering credential provider: %v", key)
 			keyring.Providers = append(keyring.Providers, provider)
 		}
 	}