Update Kubernetes packages to v1.20.1

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

cmd/flagger/main.go

@@ -25,7 +25,8 @@ import (
 	"strings"
 	"time"
 
-	semver "github.com/Masterminds/semver/v3"
+	"github.com/Masterminds/semver/v3"
+	"github.com/go-logr/zapr"
 	"go.uber.org/zap"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/uuid"
@@ -37,6 +38,7 @@ import (
 	"k8s.io/client-go/tools/leaderelection/resourcelock"
 	"k8s.io/client-go/transport"
 	_ "k8s.io/code-generator/cmd/client-gen/generators"
+	"k8s.io/klog/v2"
 
 	"github.com/fluxcd/flagger/pkg/canary"
 	clientset "github.com/fluxcd/flagger/pkg/client/clientset/versioned"
@@ -112,6 +114,7 @@ func init() {
 }
 
 func main() {
+	klog.InitFlags(nil)
 	flag.Parse()
 
 	if ver {
@@ -127,6 +130,8 @@ func main() {
 		zap.ReplaceGlobals(logger.Desugar())
 	}
 
+	klog.SetLogger(zapr.NewLogger(logger.Desugar()))
+
 	defer logger.Sync()
 
 	stopCh := signals.SetupSignalHandler()