code: func NameOrID(client *govmomi.Client, id string) string {
  	name, err := hostSystemNameFromID(client, id)
  	if err != nil {
  		return id
  	}
  	return name
  }
docs: // NameOrID is a convenience method mainly for helping displaying friendly
  // errors where space is important - it displays either the host name or the ID
  // if there was an error fetching it.