plugins/kubernetes: Switch to klog/v2 (#4778)

Signed-off-by: Manuel Rüger <manuel@rueg.eu>

plugin/kubernetes/setup.go

@@ -21,7 +21,7 @@ import (
 	_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"      // pull this in here, because we want it excluded if plugin.cfg doesn't have k8s
 	_ "k8s.io/client-go/plugin/pkg/client/auth/openstack" // pull this in here, because we want it excluded if plugin.cfg doesn't have k8s
 	"k8s.io/client-go/tools/clientcmd"
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
 )
 
 const pluginName = "kubernetes"
@@ -31,6 +31,7 @@ var log = clog.NewWithPlugin(pluginName)
 func init() { plugin.Register(pluginName, setup) }
 
 func setup(c *caddy.Controller) error {
+	klog.InitFlags(nil)
 	klog.SetOutput(os.Stdout)
 
 	k, err := kubernetesParse(c)