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

Demand verbosity level > 0 for glog Infof() calls when
setting feature gates in pkg/util/feature_gate.go.

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
 }