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/schemapatcher/internal/yaml/set.go

@@ -0,0 +1,80 @@
+/*
+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 yaml
+
+import (
+	"fmt"
+
+	"gopkg.in/yaml.v3"
+)
+
+// SetNode sets the given path to the given yaml Node, creating mapping nodes along the way.
+func SetNode(root *yaml.Node, val yaml.Node, path ...string) error {
+	currNode, path, err := asCloseAsPossible(root, path...)
+	if err != nil {
+		return err
+	}
+
+	if len(path) > 0 {
+		if currNode.Kind != yaml.MappingNode {
+			return fmt.Errorf("unexpected non-mapping before path %v", path)
+		}
+
+		for ; len(path) > 0; path = path[1:] {
+			keyNode := yaml.Node{Kind: yaml.ScalarNode, Tag: "!!str", Style: yaml.DoubleQuotedStyle, Value: path[0]}
+			nextNode := &yaml.Node{Kind: yaml.MappingNode}
+			currNode.Content = append(currNode.Content, &keyNode, nextNode)
+
+			currNode = nextNode
+		}
+	}
+
+	*currNode = val
+	return nil
+}
+
+// DeleteNode deletes the node at the given path in the given tree of mapping nodes.
+// It's a noop if the path doesn't exist.
+func DeleteNode(root *yaml.Node, path ...string) error {
+	if len(path) == 0 {
+		return fmt.Errorf("must specify a path to delete")
+	}
+	pathToParent, keyToDelete := path[:len(path)-1], path[len(path)-1]
+	parentNode, path, err := asCloseAsPossible(root, pathToParent...)
+	if err != nil {
+		return err
+	}
+	if len(path) > 0 {
+		// no-op, parent node doesn't exist
+		return nil
+	}
+
+	if parentNode.Kind != yaml.MappingNode {
+		return fmt.Errorf("unexpected non-mapping node")
+	}
+
+	for i := 0; i < len(parentNode.Content)/2; i++ {
+		keyNode := parentNode.Content[i*2]
+		if keyNode.Value == keyToDelete {
+			parentNode.Content = append(parentNode.Content[:i*2], parentNode.Content[i*2+2:]...)
+			return nil
+		}
+	}
+
+	// no-op, key not found in parent node
+	return nil
+}