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/v1/defaults.go

@@ -0,0 +1,61 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1
+
+import (
+	"strings"
+
+	"k8s.io/apimachinery/pkg/runtime"
+	utilpointer "k8s.io/utils/pointer"
+)
+
+func addDefaultingFuncs(scheme *runtime.Scheme) error {
+	return RegisterDefaults(scheme)
+}
+
+func SetDefaults_CustomResourceDefinition(obj *CustomResourceDefinition) {
+	SetDefaults_CustomResourceDefinitionSpec(&obj.Spec)
+	if len(obj.Status.StoredVersions) == 0 {
+		for _, v := range obj.Spec.Versions {
+			if v.Storage {
+				obj.Status.StoredVersions = append(obj.Status.StoredVersions, v.Name)
+				break
+			}
+		}
+	}
+}
+
+func SetDefaults_CustomResourceDefinitionSpec(obj *CustomResourceDefinitionSpec) {
+	if len(obj.Names.Singular) == 0 {
+		obj.Names.Singular = strings.ToLower(obj.Names.Kind)
+	}
+	if len(obj.Names.ListKind) == 0 && len(obj.Names.Kind) > 0 {
+		obj.Names.ListKind = obj.Names.Kind + "List"
+	}
+	if obj.Conversion == nil {
+		obj.Conversion = &CustomResourceConversion{
+			Strategy: NoneConverter,
+		}
+	}
+}
+
+// SetDefaults_ServiceReference sets defaults for Webhook's ServiceReference
+func SetDefaults_ServiceReference(obj *ServiceReference) {
+	if obj.Port == nil {
+		obj.Port = utilpointer.Int32Ptr(443)
+	}
+}