message: align output with expectation
diff: @@ -72,7 +72,6 @@ stan::io::dump get_var_context(const std::string file) {
  #ifdef STAN_MPI
  stan::math::mpi_cluster& cluster = get_mpi_cluster();
  - std::cout << "Starting MPI process " << cluster.rank_+1 << " / " << cluster.world_.size() << std::endl;
  cluster.listen();
  if (cluster.rank_ != 0) return 0;
  #endif
  