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/sigs.k8s.io/controller-tools/pkg/markers/regutil.go

@@ -0,0 +1,36 @@
+/*
+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 markers
+
+// Must panics on errors creating definitions.
+func Must(def *Definition, err error) *Definition {
+	if err != nil {
+		panic(err)
+	}
+	return def
+}
+
+// RegisterAll attempts to register all definitions against the given registry,
+// stopping and returning if an error occurs.
+func RegisterAll(reg *Registry, defs ...*Definition) error {
+	for _, def := range defs {
+		if err := reg.Register(def); err != nil {
+			return err
+		}
+	}
+	return nil
+}