use istio client-go library instead of knative (#1661)

use istio client-go library instead of knative
bump kubernetes dependency version
change code coverage to codecov

vendor/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/defaults.go

@@ -20,13 +20,11 @@ import (
 	"strings"
 
 	"k8s.io/apimachinery/pkg/runtime"
+	utilpointer "k8s.io/utils/pointer"
 )
 
 func addDefaultingFuncs(scheme *runtime.Scheme) error {
-	scheme.AddTypeDefaultingFunc(&CustomResourceDefinition{}, func(obj interface{}) { SetDefaults_CustomResourceDefinition(obj.(*CustomResourceDefinition)) })
-	// TODO figure out why I can't seem to get my defaulter generated
-	// return RegisterDefaults(scheme)
-	return nil
+	return RegisterDefaults(scheme)
 }
 
 func SetDefaults_CustomResourceDefinition(obj *CustomResourceDefinition) {
@@ -68,14 +66,17 @@ func SetDefaults_CustomResourceDefinitionSpec(obj *CustomResourceDefinitionSpec)
 			Strategy: NoneConverter,
 		}
 	}
+	if obj.Conversion.Strategy == WebhookConverter && len(obj.Conversion.ConversionReviewVersions) == 0 {
+		obj.Conversion.ConversionReviewVersions = []string{SchemeGroupVersion.Version}
+	}
+	if obj.PreserveUnknownFields == nil {
+		obj.PreserveUnknownFields = utilpointer.BoolPtr(true)
+	}
 }
 
-// hasPerVersionColumns returns true if a CRD uses per-version columns.
-func hasPerVersionColumns(versions []CustomResourceDefinitionVersion) bool {
-	for _, v := range versions {
-		if len(v.AdditionalPrinterColumns) > 0 {
-			return true
-		}
+// SetDefaults_ServiceReference sets defaults for Webhook's ServiceReference
+func SetDefaults_ServiceReference(obj *ServiceReference) {
+	if obj.Port == nil {
+		obj.Port = utilpointer.Int32Ptr(443)
 	}
-	return false
 }