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/apiserver/pkg/admission/plugin/webhook/object/doc.go

@@ -0,0 +1,20 @@
+/*
+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 object defines the utilities that are used by the webhook plugin to
+// decide if a webhook should run, as long as either the old object or the new
+// object has labels matching the webhook config's objectSelector.
+package object // import "k8s.io/apiserver/pkg/admission/plugin/webhook/object"

vendor/k8s.io/apiserver/pkg/admission/plugin/webhook/object/matcher.go

@@ -0,0 +1,57 @@
+/*
+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 object
+
+import (
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apiserver/pkg/admission"
+	"k8s.io/apiserver/pkg/admission/plugin/webhook"
+	"k8s.io/klog"
+)
+
+// Matcher decides if a request selected by the ObjectSelector.
+type Matcher struct {
+}
+
+func matchObject(obj runtime.Object, selector labels.Selector) bool {
+	if obj == nil {
+		return false
+	}
+	accessor, err := meta.Accessor(obj)
+	if err != nil {
+		klog.V(5).Infof("cannot access metadata of %v: %v", obj, err)
+		return false
+	}
+	return selector.Matches(labels.Set(accessor.GetLabels()))
+
+}
+
+// MatchObjectSelector decideds whether the request matches the ObjectSelector
+// of the webhook. Only when they match, the webhook is called.
+func (m *Matcher) MatchObjectSelector(h webhook.WebhookAccessor, attr admission.Attributes) (bool, *apierrors.StatusError) {
+	selector, err := h.GetParsedObjectSelector()
+	if err != nil {
+		return false, apierrors.NewInternalError(err)
+	}
+	if selector.Empty() {
+		return true, nil
+	}
+	return matchObject(attr.GetObject(), selector) || matchObject(attr.GetOldObject(), selector), nil
+}