code: func (cluster *KafkaCluster) KafkaAddrs() ([]string, error) {
  	containers, err := cluster.Containers()
  	if err != nil {
  		return nil, fmt.Errorf("Cannot get containers info: %s", err)
  	}
  	addrs := make([]string, 0)
  	for _, container := range containers {
  		if _, ok := container.NetworkSettings.Ports["9092/tcp"]; ok {
  			for _, network := range container.NetworkSettings.Networks {
  				if network.IPAddress != "" {
  					addrs = append(addrs, fmt.Sprintf("%s:%s", network.IPAddress, "9092"))
  					break
  				}
  			}
  		}
  	}
  	return addrs, nil
  }
docs: // KafkaAddrs return list of kafka node addresses as strings, in form
  // <host>:<port>