message: refresh to one-liner
diff: @@ -205,15 +205,7 @@ impl PoolService {
  }
  pub fn refresh(&self, handle: i32) -> Result<i32, PoolError> {
  - let cmd_id: i32 = sequence::get_next_id();
  -
  - let pools = self.open_pools.try_borrow().map_err(CommonError::from)?;
  - match pools.get(&handle) {
  - Some(ref pool) => self._send_msg(cmd_id, "refresh", &pool.cmd_socket, None, None)?,
  - None => return Err(PoolError::InvalidHandle(format!("No pool with requested handle {}", handle)))
  - };
  -
  - Ok(cmd_id)
  + self.send_action(handle, "refresh", None, None)
  }
  fn _send_msg(&self, cmd_id: i32, msg: &str, socket: &Socket, nodes: Option<&str>, timeout: Option<i32>) -> Result<(), PoolError> {
  