code: public OperationFuture<List<Server>> addSecondaryNetwork(List<Server> servers, AddNetworkConfig config) {
          List<JobFuture> futures = servers.stream()
              .map(server -> addSecondaryNetwork(server, config).jobFuture())
              .collect(toList());
  
          return new OperationFuture<>(
              servers,
              new ParallelJobsFuture(futures)
          );
      }
docs: Add secondary network
  
  @param servers server references
  @param config secondary network config
  @return OperationFuture wrapper for list of Server