message: [Smoke test] Update association_key/faucet_key -> libra_root_key
  Closes:
  Approved by: gregnazario
diff: @@ -58,7 +58,7 @@ struct TestEnvironment {
  validator_swarm: LibraSwarm,
  vfn_swarm: Option<LibraSwarm>,
  public_fn_swarm: Option<LibraSwarm>,
  - faucet_key: (Ed25519PrivateKey, String),
  + libra_root_key: (Ed25519PrivateKey, String),
  mnemonic_file: TempPath,
  }
  @@ -88,7 +88,7 @@ impl TestEnvironment {
  validator_swarm,
  vfn_swarm: None,
  public_fn_swarm: None,
  - faucet_key: (key, key_path),
  + libra_root_key: (key, key_path),
  mnemonic_file,
  }
  }
  @@ -131,8 +131,8 @@ impl TestEnvironment {
  ClientProxy::new(
  ChainId::test(),
  &format!("http://localhost:{}/v1", port),
  - &self.faucet_key.1,
  - &self.faucet_key.1,
  + &self.libra_root_key.1,
  + &self.libra_root_key.1,
  false,
  /* faucet server */ None,
  Some(mnemonic_file_path),
  @@ -1304,8 +1304,8 @@ fn test_key_manager_consensus_rotation() {
  // Submit a reconfiguration so that the key rotation will be performed on-chain
  // let libra = get_libra_interface(&node_config);
  // let time_service = RealTimeService::new();
  - // let association_key = env.faucet_key.0;
  - // submit_new_reconfig(&libra, &time_service, &association_key).unwrap();
  + // let libra_root_key = env.libra_root_key.0;
  + // submit_new_reconfig(&libra, &time_service, &libra_root_key).unwrap();
  // sleep(Duration::from_secs(2));
  // Verify the consensus key has been rotated in secure storage and on-chain.
  