Merge pull request #52362 from fabriziopandini/kubeadm436

Automatic merge from submit-queue (batch tested with PRs 51601, 52153, 52364, 52362, 52342) fix kubeadm token create error **What this PR does / why we need it**: fix kubeadm token create error **Which issue this PR fixes** [#436](https://github.com/kubernetes/kubeadm/issues/436) **Special notes for your reviewer**: CC @luxas

Merge pull request #52362 from fabriziopandini/kubeadm436
e1b446f8 · Kubernetes Submit Queue · GitHub · e36b4fda · 36562db3 · e1b446f8
Commit e1b446f8 authored Sep 13, 2017 by Kubernetes Submit Queue Committed by GitHub Sep 13, 2017
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token.go cmd/kubeadm/app/cmd/token.go +1 -2

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--- a/cmd/kubeadm/app/cmd/token.go
+++ b/cmd/kubeadm/app/cmd/token.go
@@ -213,8 +213,7 @@ func RunCreateToken(out io.Writer, client clientset.Interface, token string, tok
 	}

 	// adding groups only makes sense for authentication
-	var usagesSet sets.String
-	usagesSet.Insert(usages...)
+	usagesSet := sets.NewString(usages...)
 	if len(extraGroups) > 0 && !usagesSet.Has("authentication") {
 		return fmt.Errorf("--groups cannot be specified unless --usages includes \"authentication\"")
 	}