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

test/integration/ipamperf/main_test.go

@@ -20,7 +20,7 @@ import (
 	"flag"
 	"testing"
 
-	"github.com/golang/glog"
+	"k8s.io/klog"
 	"k8s.io/kubernetes/pkg/controller/nodeipam/ipam"
 	"k8s.io/kubernetes/test/integration/framework"
 )
@@ -59,7 +59,7 @@ func TestMain(m *testing.M) {
 	case string(ipam.IPAMFromClusterAllocatorType):
 		customConfig.AllocatorType = ipam.IPAMFromClusterAllocatorType
 	default:
-		glog.Fatalf("Unknown allocator type: %s", allocator)
+		klog.Fatalf("Unknown allocator type: %s", allocator)
 	}
 
 	framework.EtcdMain(m.Run)