tests, single stack ipv6: skip istio tests

ipv6 support is in alpha stage on Istio u/s and is not supported yet
by kubevirt.

Note: even once ipv6 will be fully supported by istio, kubevirt may have
troubles to make it work for VMs because there is no IPv6 equialent to
"sysctl net.ipv4.conf.all.route_localnet".

Signed-off-by: Alona Kaplan <alkaplan@redhat.com>

tests/network/vmi_istio.go

@@ -26,6 +26,8 @@ import (
 	"strings"
 	"time"
 
+	k8sv1 "k8s.io/api/core/v1"
+
 	"kubevirt.io/kubevirt/tests/framework/checks"
 
 	expect "github.com/google/goexpect"
@@ -101,7 +103,7 @@ var _ = SIGDescribe("[Serial] Istio", func() {
 			By("Getting back the VMI IP")
 			vmi, err = virtClient.VirtualMachineInstance(vmi.Namespace).Get(vmi.Name, &metav1.GetOptions{})
 			Expect(err).ShouldNot(HaveOccurred())
-			vmiIP := vmi.Status.Interfaces[0].IP
+			vmiIP := libnet.GetVmiPrimaryIpByFamily(vmi, k8sv1.IPv4Protocol)
 
 			By("Running job to send a request to the server")
 			return virtClient.BatchV1().Jobs(util.NamespaceTestDefault).Create(
@@ -116,6 +118,8 @@ var _ = SIGDescribe("[Serial] Istio", func() {
 			virtClient, err = kubecli.GetKubevirtClient()
 			util.PanicOnError(err)
 
+			libnet.SkipWhenClusterNotSupportIpv4(virtClient)
+
 			By("Create NetworkAttachmentDefinition")
 			nad := generateIstioCNINetworkAttachmentDefinition()
 			_, err = virtClient.NetworkClient().K8sCniCncfIoV1().NetworkAttachmentDefinitions(util.NamespaceTestDefault).Create(context.TODO(), nad, metav1.CreateOptions{})
@@ -219,7 +223,7 @@ var _ = SIGDescribe("[Serial] Istio", func() {
 					By("Getting the VMI IP")
 					vmi, err = virtClient.VirtualMachineInstance(vmi.Namespace).Get(vmi.Name, &metav1.GetOptions{})
 					Expect(err).ShouldNot(HaveOccurred())
-					vmiIP := vmi.Status.Interfaces[0].IP
+					vmiIP := libnet.GetVmiPrimaryIpByFamily(vmi, k8sv1.IPv4Protocol)
 
 					Expect(
 						checkSSHConnection(bastionVMI, "fedora", vmiIP),
@@ -234,7 +238,7 @@ var _ = SIGDescribe("[Serial] Istio", func() {
 					By("Getting the VMI IP")
 					vmi, err = virtClient.VirtualMachineInstance(vmi.Namespace).Get(vmi.Name, &metav1.GetOptions{})
 					Expect(err).ShouldNot(HaveOccurred())
-					vmiIP := vmi.Status.Interfaces[0].IP
+					vmiIP := libnet.GetVmiPrimaryIpByFamily(vmi, k8sv1.IPv4Protocol)
 
 					Expect(
 						checkSSHConnection(bastionVMI, "fedora", vmiIP),