code: func (c *Client) GetInstanceIPAddresses(d *openstack.Driver) ([]openstack.IPAddress, error) {
  	server, err := c.GetServerDetail(d)
  	if err != nil {
  		return nil, err
  	}
  	return []openstack.IPAddress{
  		{
  			Network:     "public",
  			Address:     server.AccessIPv4,
  			AddressType: openstack.Fixed,
  		},
  	}, nil
  }
docs: // GetInstanceIPAddresses can be short-circuited with the server's AccessIPv4Addr on Rackspace.