Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/k8s.io/apimachinery/pkg/util/waitgroup/waitgroup.go

@@ -0,0 +1,57 @@
+/*
+Copyright 2017 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 waitgroup
+
+import (
+	"fmt"
+	"sync"
+)
+
+// SafeWaitGroup must not be copied after first use.
+type SafeWaitGroup struct {
+	wg sync.WaitGroup
+	mu sync.RWMutex
+	// wait indicate whether Wait is called, if true,
+	// then any Add with positive delta will return error.
+	wait bool
+}
+
+// Add adds delta, which may be negative, similar to sync.WaitGroup.
+// If Add with a positive delta happens after Wait, it will return error,
+// which prevent unsafe Add.
+func (wg *SafeWaitGroup) Add(delta int) error {
+	wg.mu.RLock()
+	defer wg.mu.RUnlock()
+	if wg.wait && delta > 0 {
+		return fmt.Errorf("add with positive delta after Wait is forbidden")
+	}
+	wg.wg.Add(delta)
+	return nil
+}
+
+// Done decrements the WaitGroup counter.
+func (wg *SafeWaitGroup) Done() {
+	wg.wg.Done()
+}
+
+// Wait blocks until the WaitGroup counter is zero.
+func (wg *SafeWaitGroup) Wait() {
+	wg.mu.Lock()
+	wg.wait = true
+	wg.mu.Unlock()
+	wg.wg.Wait()
+}