code: public static ZabMessage.ClusterConfiguration
    buildConfig(ClusterConfiguration config) {
      ZabMessage.Zxid version = toProtoZxid(config.getVersion());
      return ZabMessage.ClusterConfiguration.newBuilder()
                                            .setVersion(version)
                                            .addAllServers(config.getPeers())
                                            .build();
    }
docs: Creates a ZabMessage.ClusterConfiguration object.
  
  @param config the ClusterConfiguration object.
  @return protobuf ClusterConfiguration object.