fix log message for self-signed cert generation

pkg/genericapiserver/genericapiserver.go

@@ -698,7 +698,7 @@ func (s *GenericAPIServer) Run(options *ServerRunOptions) {
 				if err := crypto.GenerateSelfSignedCert(s.ClusterIP.String(), options.TLSCertFile, options.TLSPrivateKeyFile, alternateIPs, alternateDNS); err != nil {
 					glog.Errorf("Unable to generate self signed cert: %v", err)
 				} else {
-					glog.Infof("Using self-signed cert (%options, %options)", options.TLSCertFile, options.TLSPrivateKeyFile)
+					glog.Infof("Using self-signed cert (%s, %s)", options.TLSCertFile, options.TLSPrivateKeyFile)
 				}
 			}
 		}