message: [smoke tests] test_basic_state_synchronization fix
  according to
  client fails to connect to validator after one of validators gets disabled
  reason is LibraSwarm::get_ac_port function uses index in different way than LibraSwarm::kill_node
  Closes:
  Approved by: zekun000
diff: @@ -472,13 +472,8 @@ impl LibraSwarm {
  /// A specific public AC port of a validator or a full node.
  pub fn get_ac_port(&self, index: usize) -> u16 {
  - *self
  - .nodes
  - .values()
  - .map(|node| node.ac_port())
  - .collect::<Vec<u16>>()
  - .get(index)
  - .unwrap()
  + let node_id = format!("{}", index);
  + self.nodes.get(&node_id).map(|node| node.ac_port()).unwrap()
  }
  /// Vector with the peer ids of the validators in the swarm.
  