Remove firewalld running log

- The info it provides can be found elsewhere
  The logs gets printed too often becasue of
  the programming being done in the tasks

Signed-off-by: Alessandro Boch <aboch@docker.com>

libnetwork/iptables/firewalld.go

@@ -151,7 +151,6 @@ func checkRunning() bool {
 
 	if connection != nil {
 		err = connection.sysobj.Call(dbusInterface+".getDefaultZone", 0).Store(&zone)
-		logrus.Infof("Firewalld running: %t", err == nil)
 		return err == nil
 	}
 	return false