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/keyring.go

@@ -23,7 +23,7 @@ import (
 	"sort"
 	"strings"
 
-	"github.com/golang/glog"
+	"k8s.io/klog"
 
 	"k8s.io/apimachinery/pkg/util/sets"
 )
@@ -113,7 +113,7 @@ func (dk *BasicDockerKeyring) Add(cfg DockerConfig) {
 		}
 		parsed, err := url.Parse(value)
 		if err != nil {
-			glog.Errorf("Entry %q in dockercfg invalid (%v), ignoring", loc, err)
+			klog.Errorf("Entry %q in dockercfg invalid (%v), ignoring", loc, err)
 			continue
 		}