Don't run preserve pod IP test in userspace mode

test/e2e/framework/util.go

@@ -346,6 +346,35 @@ func NodeOSDistroIs(supportedNodeOsDistros ...string) bool {
 	return false
 }
 
+func ProxyMode(f *Framework) (string, error) {
+	pod := &v1.Pod{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "kube-proxy-mode-detector",
+			Namespace: f.Namespace.Name,
+		},
+		Spec: v1.PodSpec{
+			HostNetwork: true,
+			Containers: []v1.Container{
+				{
+					Name:    "detector",
+					Image:   "gcr.io/google_containers/e2e-net-amd64:1.0",
+					Command: []string{"/bin/sleep", "3600"},
+				},
+			},
+		},
+	}
+	f.PodClient().CreateSync(pod)
+	defer f.PodClient().DeleteSync(pod.Name, &metav1.DeleteOptions{}, time.Minute)
+
+	cmd := "curl -q -s --connect-timeout 1 http://localhost:10249/proxyMode"
+	stdout, err := RunHostCmd(pod.Namespace, pod.Name, cmd)
+	if err != nil {
+		return "", err
+	}
+	Logf("ProxyMode: %s", stdout)
+	return stdout, nil
+}
+
 func SkipUnlessServerVersionGTE(v *utilversion.Version, c discovery.ServerVersionInterface) {
 	gte, err := ServerVersionGTE(v, c)
 	if err != nil {