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/strategicpatch/patch.go

@@ -1014,7 +1014,7 @@ func validatePatchWithSetOrderList(patchList, setOrderList interface{}, mergeKey
 		setOrderIndex++
 	}
 	// If patchIndex is inbound but setOrderIndex if out of bound mean there are items mismatching between the patch list and setElementOrder list.
-	// the second check is is a sanity check, and should always be true if the first is true.
+	// the second check is a sanity check, and should always be true if the first is true.
 	if patchIndex < len(nonDeleteList) && setOrderIndex >= len(typedSetOrderList) {
 		return fmt.Errorf("The order in patch list:\n%v\n doesn't match %s list:\n%v\n", typedPatchList, setElementOrderDirectivePrefix, setOrderList)
 	}