*: initial update to kube 1.8

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

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

@@ -17,8 +17,10 @@ limitations under the License.
 package wait
 
 import (
+	"context"
 	"errors"
 	"math/rand"
+	"sync"
 	"time"
 
 	"k8s.io/apimachinery/pkg/util/runtime"
@@ -36,6 +38,40 @@ var ForeverTestTimeout = time.Second * 30
 // NeverStop may be passed to Until to make it never stop.
 var NeverStop <-chan struct{} = make(chan struct{})
 
+// Group allows to start a group of goroutines and wait for their completion.
+type Group struct {
+	wg sync.WaitGroup
+}
+
+func (g *Group) Wait() {
+	g.wg.Wait()
+}
+
+// StartWithChannel starts f in a new goroutine in the group.
+// stopCh is passed to f as an argument. f should stop when stopCh is available.
+func (g *Group) StartWithChannel(stopCh <-chan struct{}, f func(stopCh <-chan struct{})) {
+	g.Start(func() {
+		f(stopCh)
+	})
+}
+
+// StartWithContext starts f in a new goroutine in the group.
+// ctx is passed to f as an argument. f should stop when ctx.Done() is available.
+func (g *Group) StartWithContext(ctx context.Context, f func(context.Context)) {
+	g.Start(func() {
+		f(ctx)
+	})
+}
+
+// Start starts f in a new goroutine in the group.
+func (g *Group) Start(f func()) {
+	g.wg.Add(1)
+	go func() {
+		defer g.wg.Done()
+		f()
+	}()
+}
+
 // Forever calls f every period for ever.
 //
 // Forever is syntactic sugar on top of Until.