libmachine/drivers/serial.go
func (d *SerialDriver) DriverName() string {
	d.Lock()
	defer d.Unlock()
	return d.Driver.DriverName()
}
func (d *SerialDriver) DriverName() string {
	d.Lock()
	defer d.Unlock()
	return d.Driver.DriverName()
}
// DriverName returns the name of the driver as it is registered