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/client-go/tools/cache/delta_fifo.go

@@ -295,13 +295,6 @@ func isDeletionDup(a, b *Delta) *Delta {
 	return b
 }
 
-// willObjectBeDeletedLocked returns true only if the last delta for the
-// given object is Delete. Caller must lock first.
-func (f *DeltaFIFO) willObjectBeDeletedLocked(id string) bool {
-	deltas := f.items[id]
-	return len(deltas) > 0 && deltas[len(deltas)-1].Type == Deleted
-}
-
 // queueActionLocked appends to the delta list for the object.
 // Caller must lock first.
 func (f *DeltaFIFO) queueActionLocked(actionType DeltaType, obj interface{}) error {
@@ -310,13 +303,6 @@ func (f *DeltaFIFO) queueActionLocked(actionType DeltaType, obj interface{}) err
 		return KeyError{obj, err}
 	}
 
-	// If object is supposed to be deleted (last event is Deleted),
-	// then we should ignore Sync events, because it would result in
-	// recreation of this object.
-	if actionType == Sync && f.willObjectBeDeletedLocked(id) {
-		return nil
-	}
-
 	newDeltas := append(f.items[id], Delta{actionType, obj})
 	newDeltas = dedupDeltas(newDeltas)
 
@@ -539,13 +525,6 @@ func (f *DeltaFIFO) Resync() error {
 	return nil
 }
 
-func (f *DeltaFIFO) syncKey(key string) error {
-	f.lock.Lock()
-	defer f.lock.Unlock()
-
-	return f.syncKeyLocked(key)
-}
-
 func (f *DeltaFIFO) syncKeyLocked(key string) error {
 	obj, exists, err := f.knownObjects.GetByKey(key)
 	if err != nil {