fixing various unit tests on Windows that create abstract sockets

by now having them create file-based sockets on windows/darwin

Signed-off-by: Mark Rossetti <[email protected]>

Kubernetes-commit: 5e6611af5594078a76694f0cf9fb7eef1299ff40

pkg/util/net/testing/socket.go

@@ -0,0 +1,41 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package nettesting contains utilities for testing networking functionality.
+// Don't use these utilities in production code. They have not been security
+// reviewed.
+package nettesting
+
+import (
+	"os"
+	goruntime "runtime"
+	"testing"
+)
+
+// MakeSocketNameForTest returns a socket name to use for the duration of a test.
+// On Operating systems that support abstract sockets, it the name is prefixed with `@` to make it an abstract socket.
+// On Operating systems that do not support abstract sockets, the name is treated as a filename and a cleanup hook is
+// registered to delete the socket at the end of the test.
+func MakeSocketNameForTest(t testing.TB, name string) string {
+	var sockname = name
+	switch goruntime.GOOS {
+	case "darwin", "windows":
+		t.Cleanup(func() { _ = os.Remove(sockname) })
+	default:
+		sockname = "@" + name
+	}
+	return sockname
+}