func DeviceListString(l object.VirtualDeviceList) string {
	var names []string
	for _, d := range l {
		if d == nil {
			names = append(names, "<nil>")
		} else {
			names = append(names, l.Name(d))
		}
	}
	return strings.Join(names, ",")
}
func DeviceListString(l object.VirtualDeviceList) string {
	var names []string
	for _, d := range l {
		if d == nil {
			names = append(names, "<nil>")
		} else {
			names = append(names, l.Name(d))
		}
	}
	return strings.Join(names, ",")
}
// DeviceListString pretty-prints each device in a virtual device list, used
// for logging purposes and what not.