Merge pull request #65584 from neolit123/token-output

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

apiserver: do not print feature gates for glog v=0

**What this PR does / why we need it**:
Demand verbosity level > 0 for glog Infof() calls when
setting feature gates in pkg/util/feature_gate.go.

Without this, regular calls to things like `kubeadm token generate` would also print `feature_gate.go:230] feature gates: &{map[]}`.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes kubernetes/kubeadm#953

**Special notes for your reviewer**:
i doubt there is a particular reason to not use verbosity level here?
is `v=1` sufficient here?

/area apiserver
/area kubeadm
/kind cleanup
/cc @kubernetes/sig-cluster-lifecycle-pr-reviews 
/cc @kubernetes/sig-api-machinery-pr-reviews 

**Release note**:

```release-note
NONE
```

staging/src/k8s.io/apiserver/pkg/util/feature/feature_gate.go

@@ -191,7 +191,7 @@ func (f *featureGate) Set(value string) error {
 	f.known.Store(known)
 	f.enabled.Store(enabled)
 
-	glog.Infof("feature gates: %v", enabled)
+	glog.V(1).Infof("feature gates: %v", enabled)
 	return nil
 }
 
@@ -227,7 +227,7 @@ func (f *featureGate) SetFromMap(m map[string]bool) error {
 	f.known.Store(known)
 	f.enabled.Store(enabled)
 
-	glog.Infof("feature gates: %v", f.enabled)
+	glog.V(1).Infof("feature gates: %v", f.enabled)
 	return nil
 }