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/zz_generated.deepcopy.go

@@ -48,6 +48,11 @@ func (in *CustomResourceConversion) DeepCopyInto(out *CustomResourceConversion)
 		*out = new(WebhookClientConfig)
 		(*in).DeepCopyInto(*out)
 	}
+	if in.ConversionReviewVersions != nil {
+		in, out := &in.ConversionReviewVersions, &out.ConversionReviewVersions
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
 	return
 }
 
@@ -110,7 +115,7 @@ func (in *CustomResourceDefinitionCondition) DeepCopy() *CustomResourceDefinitio
 func (in *CustomResourceDefinitionList) DeepCopyInto(out *CustomResourceDefinitionList) {
 	*out = *in
 	out.TypeMeta = in.TypeMeta
-	out.ListMeta = in.ListMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
 	if in.Items != nil {
 		in, out := &in.Items, &out.Items
 		*out = make([]CustomResourceDefinition, len(*in))
@@ -196,6 +201,11 @@ func (in *CustomResourceDefinitionSpec) DeepCopyInto(out *CustomResourceDefiniti
 		*out = new(CustomResourceConversion)
 		(*in).DeepCopyInto(*out)
 	}
+	if in.PreserveUnknownFields != nil {
+		in, out := &in.PreserveUnknownFields, &out.PreserveUnknownFields
+		*out = new(bool)
+		**out = **in
+	}
 	return
 }