Use code-generator to generate clientset/informer/lister (#1492)

To reduce maintenance effort and avoid writing duplicate informer code,
use code-generator to generate clientset/informer/lister code.

pkg/router/router_test.go

@@ -61,7 +61,7 @@ func TestRouter(t *testing.T) {
 	triggerUrl := "/foo"
 	triggers.triggers = append(triggers.triggers,
 		fv1.HTTPTrigger{
-			Metadata: metav1.ObjectMeta{
+			ObjectMeta: metav1.ObjectMeta{
 				Name:            "xxx",
 				Namespace:       metav1.NamespaceDefault,
 				ResourceVersion: "1234",
@@ -83,7 +83,7 @@ func TestRouter(t *testing.T) {
 
 	fnMetaMap := make(map[string]*fv1.Function, 1)
 	fnMetaMap[fnMeta.Name] = &fv1.Function{
-		Metadata: fnMeta,
+		ObjectMeta: fnMeta,
 	}
 
 	rr := resolveResult{