Add a test to ensure we can handle alt client-go versions

Test to ensure istio/api#3127 work doesn't
cause regressions

pilot/pkg/config/kube/crdclient/client_test.go

@@ -15,7 +15,10 @@
 package crdclient
 
 import (
+	"context"
 	"fmt"
+	"istio.io/api/networking/v1beta1"
+	apiistioioapinetworkingv1beta1 "istio.io/client-go/pkg/apis/networking/v1beta1"
 	"reflect"
 	"testing"
 	"time"
@@ -433,3 +436,16 @@ func TestClientSync(t *testing.T) {
 	// This MUST have been called by the time HasSynced returns true
 	assert.Equal(t, events.Load(), 1)
 }
+
+func TestAlternativeVersions(t *testing.T) {
+	fake := kube.NewFakeClient()
+	fake.RunAndWait(test.NewStop(t))
+	vs := apiistioioapinetworkingv1beta1.VirtualService{
+		TypeMeta:   metav1.TypeMeta{},
+		ObjectMeta: metav1.ObjectMeta{Name: "oo"},
+		Spec:       v1beta1.VirtualService{Hosts: []string{"hello"}},
+		Status:     v1alpha1.IstioStatus{},
+	}
+	_, err := fake.Istio().NetworkingV1beta1().VirtualServices("test").Create(context.Background(), &vs, metav1.CreateOptions{})
+	assert.NoError(t, err)
+}