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/provider.go

@@ -22,7 +22,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/golang/glog"
+	"k8s.io/klog"
 )
 
 // DockerConfigProvider is the interface that registered extensions implement
@@ -83,7 +83,7 @@ func (d *defaultDockerConfigProvider) Provide() DockerConfig {
 	if cfg, err := ReadDockerConfigFile(); err == nil {
 		return cfg
 	} else if !os.IsNotExist(err) {
-		glog.V(4).Infof("Unable to parse Docker config file: %v", err)
+		klog.V(4).Infof("Unable to parse Docker config file: %v", err)
 	}
 	return DockerConfig{}
 }
@@ -113,7 +113,7 @@ func (d *CachingDockerConfigProvider) Provide() DockerConfig {
 		return d.cacheDockerConfig
 	}
 
-	glog.V(2).Infof("Refreshing cache for provider: %v", reflect.TypeOf(d.Provider).String())
+	klog.V(2).Infof("Refreshing cache for provider: %v", reflect.TypeOf(d.Provider).String())
 	d.cacheDockerConfig = d.Provider.Provide()
 	d.expiration = time.Now().Add(d.Lifetime)
 	return d.cacheDockerConfig