1. update clientset, deepcopy using code-generator

2. add a dummy file tools.go to force "go mod vendor" to see
code-generator as dependencies
3. add a script to update CRD
4. add a README to document CRD updating steps
run go mod tidy
update README

vendor/github.com/emicklei/go-restful/jsoniter.go

@@ -0,0 +1,12 @@
+// +build jsoniter
+
+package restful
+
+import "github.com/json-iterator/go"
+
+var (
+	json          = jsoniter.ConfigCompatibleWithStandardLibrary
+	MarshalIndent = json.MarshalIndent
+	NewDecoder    = json.NewDecoder
+	NewEncoder    = json.NewEncoder
+)