message: ci: fix potential failure in integration test TransactionRelayLowFeeRate
diff: use crate::node::connect_all;
  +use crate::node::waiting_for_sync;
  use crate::util::cell::{as_input, as_output, gen_spendable};
  use crate::util::log_monitor::monitor_log_until_expected_show;
  use crate::util::mining::out_ibd_mode;
  @@ -31,6 +32,10 @@ impl Spec for TransactionRelayLowFeeRate {
  .rpc_client()
  .dry_run_transaction(low_fee.data().into())
  .cycles;
  +
  + log::debug!("make sure node1 has the cell");
  + waiting_for_sync(nodes);
  +
  node0
  .rpc_client()
  .broadcast_transaction(low_fee.data().into(), low_cycles)
  