feat: generate unique namespace names for UDN tests

Fix namespace creation issue in UDN tests by generating unique namespace names instead of reusing existing test namespace. Previously, the CreateNamespaceUDN function would fail with "namespace already exists" errors because it was using the existing test namespace name. Now it generates a unique name using SimpleNameGenerator and sets it as the current namespace before creation. Also made the user-defined network label value empty to match test requirements.

Author: rioliu-rh

test/extended/util/util_otp.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"k8s.io/apiserver/pkg/storage/names"
 	e2e "k8s.io/kubernetes/test/e2e/framework"
 
 	corev1 "k8s.io/api/core/v1"
@@ -69,12 +70,18 @@ func (c *CLI) WithoutKubeconf() *CLI {
 // CreateNamespaceUDN creates a new namespace with required user defined network label during creation time only
 // required for testing networking UDN features on 4.17z+
 func (c *CLI) CreateNamespaceUDN() {
+	// Create new namespace name here, because c.Namespace() will get existing test namespace
+	// namespace Create func will be failed with below error
+	// namespaces "e2e-test-xxx" already exists
+	newNsName := names.SimpleNameGenerator.GenerateName(fmt.Sprintf("e2e-test-udn-%s-", c.kubeFramework.BaseName))
+	c.SetNamespace(newNsName)
+
 	labels := map[string]string{
-		"k8s.ovn.org/primary-user-defined-network": "udn-net",
+		"k8s.ovn.org/primary-user-defined-network": "",
 	}
 	namespace := &corev1.Namespace{
 		ObjectMeta: metav1.ObjectMeta{
-			Name:   c.Namespace(),
+			Name:   newNsName,
 			Labels: labels,
 		},
 	}