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/genall/help/pretty/doc.go

@@ -0,0 +1,30 @@
+/*
+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 pretty contains utilities for formatting terminal help output,
+// and a use of those to display marker help.
+//
+// Terminal Output
+//
+// The Span interface and Table struct allow you to construct tables with
+// colored formatting, without causing ANSI formatting characters to mess up width
+// calculations.
+//
+// Marker Help
+//
+// The MarkersSummary prints a summary table for marker help, while the MarkersDetails
+// prints out more detailed information, with explainations of the individual marker fields.
+package pretty