message: [easy] Remove unnecessary unwraps
  Try sytax [works on option](https://doc.rust-lang.org/edition-guide/rust-2018/error-handling-and-panics/the-question-mark-operator-for-easier-error-handling.html)
  Remove 2x unwrap from testutils
  Removing an unwrap from libra_swarm
  Closes:
  Approved by: zamsden
diff: @@ -301,7 +301,7 @@ impl LibraSwarm {
  .with_faucet_keypair(faucet_account_keypair)
  .with_role(role)
  .with_upstream_config_dir(upstream_config_dir.clone());
  - let config = config_builder.build().unwrap();
  + let config = config_builder.build()?;
  Ok(Self {
  dir: swarm_config_dir,
  nodes: HashMap::new(),
  