message: [libra-swarm] Instantiate a logger so we get logging output
  Closes:
  Approved by: bmwill
diff: @@ -37,6 +37,8 @@ fn main() {
  let num_nodes = args.num_nodes;
  let num_full_nodes = args.num_full_nodes;
  + libra_logger::init_for_e2e_testing();
  +
  let mut validator_swarm = LibraSwarm::configure_swarm(
  num_nodes,
  RoleType::Validator,
  