libmachine/drivers/serial.go
func (d *SerialDriver) GetIP() (string, error) {
	d.Lock()
	defer d.Unlock()
	return d.Driver.GetIP()
}
func (d *SerialDriver) GetIP() (string, error) {
	d.Lock()
	defer d.Unlock()
	return d.Driver.GetIP()
}
// GetIP returns an IP or hostname that this host is available at
// e.g. 1.2.3.4 or docker-host-d60b70a14d3a.cloudapp.net