Upgrade k8s package verison (#5358)

* upgrade k8s package version

Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io>

* Script upgrade and code formatting.

Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io>

Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io>

vendor/k8s.io/apiserver/pkg/util/flowcontrol/apf_context.go

@@ -0,0 +1,93 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package flowcontrol
+
+import (
+	"context"
+	"sync"
+)
+
+type priorityAndFairnessKeyType int
+
+const (
+	// priorityAndFairnessInitializationSignalKey is a key under which
+	// initialization signal function for watch requests is stored
+	// in the context.
+	priorityAndFairnessInitializationSignalKey priorityAndFairnessKeyType = iota
+)
+
+// WithInitializationSignal creates a copy of parent context with
+// priority and fairness initialization signal value.
+func WithInitializationSignal(ctx context.Context, signal InitializationSignal) context.Context {
+	return context.WithValue(ctx, priorityAndFairnessInitializationSignalKey, signal)
+}
+
+// initializationSignalFrom returns an initialization signal function
+// which when called signals that watch initialization has already finished
+// to priority and fairness dispatcher.
+func initializationSignalFrom(ctx context.Context) (InitializationSignal, bool) {
+	signal, ok := ctx.Value(priorityAndFairnessInitializationSignalKey).(InitializationSignal)
+	return signal, ok && signal != nil
+}
+
+// WatchInitialized sends a signal to priority and fairness dispatcher
+// that a given watch request has already been initialized.
+func WatchInitialized(ctx context.Context) {
+	if signal, ok := initializationSignalFrom(ctx); ok {
+		signal.Signal()
+	}
+}
+
+// RequestDelegated informs the priority and fairness dispatcher that
+// a given request has been delegated to an aggregated API
+// server. No-op when priority and fairness is disabled.
+func RequestDelegated(ctx context.Context) {
+	// The watch initialization signal doesn't traverse request
+	// boundaries, so we generously fire it as soon as we know
+	// that the request won't be serviced locally. Safe to call
+	// for non-watch requests.
+	WatchInitialized(ctx)
+}
+
+// InitializationSignal is an interface that allows sending and handling
+// initialization signals.
+type InitializationSignal interface {
+	// Signal notifies the dispatcher about finished initialization.
+	Signal()
+	// Wait waits for the initialization signal.
+	Wait()
+}
+
+type initializationSignal struct {
+	once sync.Once
+	done chan struct{}
+}
+
+func NewInitializationSignal() InitializationSignal {
+	return &initializationSignal{
+		once: sync.Once{},
+		done: make(chan struct{}),
+	}
+}
+
+func (i *initializationSignal) Signal() {
+	i.once.Do(func() { close(i.done) })
+}
+
+func (i *initializationSignal) Wait() {
+	<-i.done
+}