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/k8s.io/apimachinery/pkg/util/sets/byte.go

@@ -46,17 +46,19 @@ func ByteKeySet(theMap interface{}) Byte {
 }
 
 // Insert adds items to the set.
-func (s Byte) Insert(items ...byte) {
+func (s Byte) Insert(items ...byte) Byte {
 	for _, item := range items {
 		s[item] = Empty{}
 	}
+	return s
 }
 
 // Delete removes all items from the set.
-func (s Byte) Delete(items ...byte) {
+func (s Byte) Delete(items ...byte) Byte {
 	for _, item := range items {
 		delete(s, item)
 	}
+	return s
 }
 
 // Has returns true if and only if item is contained in the set.