Update go mod and vendor in client dir to 0.28.0

client/vendor/k8s.io/client-go/tools/cache/fifo.go

@@ -25,7 +25,7 @@ import (
 
 // PopProcessFunc is passed to Pop() method of Queue interface.
 // It is supposed to process the accumulator popped from the queue.
-type PopProcessFunc func(interface{}) error
+type PopProcessFunc func(obj interface{}, isInInitialList bool) error
 
 // ErrRequeue may be returned by a PopProcessFunc to safely requeue
 // the current item. The value of Err will be returned from Pop.
@@ -82,9 +82,12 @@ type Queue interface {
 // Pop is helper function for popping from Queue.
 // WARNING: Do NOT use this function in non-test code to avoid races
 // unless you really really really really know what you are doing.
+//
+// NOTE: This function is deprecated and may be removed in the future without
+// additional warning.
 func Pop(queue Queue) interface{} {
 	var result interface{}
-	queue.Pop(func(obj interface{}) error {
+	queue.Pop(func(obj interface{}, isInInitialList bool) error {
 		result = obj
 		return nil
 	})
@@ -149,6 +152,10 @@ func (f *FIFO) Close() {
 func (f *FIFO) HasSynced() bool {
 	f.lock.Lock()
 	defer f.lock.Unlock()
+	return f.hasSynced_locked()
+}
+
+func (f *FIFO) hasSynced_locked() bool {
 	return f.populated && f.initialPopulationCount == 0
 }
 
@@ -287,6 +294,7 @@ func (f *FIFO) Pop(process PopProcessFunc) (interface{}, error) {
 
 			f.cond.Wait()
 		}
+		isInInitialList := !f.hasSynced_locked()
 		id := f.queue[0]
 		f.queue = f.queue[1:]
 		if f.initialPopulationCount > 0 {
@@ -298,7 +306,7 @@ func (f *FIFO) Pop(process PopProcessFunc) (interface{}, error) {
 			continue
 		}
 		delete(f.items, id)
-		err := process(item)
+		err := process(item, isInInitialList)
 		if e, ok := err.(ErrRequeue); ok {
 			f.addIfNotPresent(id, item)
 			err = e.Err