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/istio.io/client-go/pkg/clientset/versioned/scheme/doc.gen.go

@@ -0,0 +1,4 @@
+// Code generated by client-gen. DO NOT EDIT.
+
+// This package contains the scheme of the automatically generated clientset.
+package scheme

vendor/istio.io/client-go/pkg/clientset/versioned/scheme/register.gen.go

@@ -0,0 +1,48 @@
+// Code generated by client-gen. DO NOT EDIT.
+
+package scheme
+
+import (
+	authenticationv1alpha1 "istio.io/client-go/pkg/apis/authentication/v1alpha1"
+	configv1alpha2 "istio.io/client-go/pkg/apis/config/v1alpha2"
+	networkingv1alpha3 "istio.io/client-go/pkg/apis/networking/v1alpha3"
+	rbacv1alpha1 "istio.io/client-go/pkg/apis/rbac/v1alpha1"
+	securityv1beta1 "istio.io/client-go/pkg/apis/security/v1beta1"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	runtime "k8s.io/apimachinery/pkg/runtime"
+	schema "k8s.io/apimachinery/pkg/runtime/schema"
+	serializer "k8s.io/apimachinery/pkg/runtime/serializer"
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+)
+
+var Scheme = runtime.NewScheme()
+var Codecs = serializer.NewCodecFactory(Scheme)
+var ParameterCodec = runtime.NewParameterCodec(Scheme)
+var localSchemeBuilder = runtime.SchemeBuilder{
+	authenticationv1alpha1.AddToScheme,
+	configv1alpha2.AddToScheme,
+	networkingv1alpha3.AddToScheme,
+	rbacv1alpha1.AddToScheme,
+	securityv1beta1.AddToScheme,
+}
+
+// AddToScheme adds all types of this clientset into the given scheme. This allows composition
+// of clientsets, like in:
+//
+//   import (
+//     "k8s.io/client-go/kubernetes"
+//     clientsetscheme "k8s.io/client-go/kubernetes/scheme"
+//     aggregatorclientsetscheme "k8s.io/kube-aggregator/pkg/client/clientset_generated/clientset/scheme"
+//   )
+//
+//   kclientset, _ := kubernetes.NewForConfig(c)
+//   _ = aggregatorclientsetscheme.AddToScheme(clientsetscheme.Scheme)
+//
+// After this, RawExtensions in Kubernetes types will serialize kube-aggregator types
+// correctly.
+var AddToScheme = localSchemeBuilder.AddToScheme
+
+func init() {
+	v1.AddToGroupVersion(Scheme, schema.GroupVersion{Version: "v1"})
+	utilruntime.Must(AddToScheme(Scheme))
+}