message: Increase the threshold on which net_plugin just sends the txn
  (instead of notice/request dance)
diff: @@ -288,7 +288,7 @@ namespace eosio {
  constexpr auto def_txn_expire_wait = std::chrono::seconds(3);
  constexpr auto def_resp_expected_wait = std::chrono::seconds(1);
  constexpr auto def_sync_fetch_span = 100;
  - constexpr auto def_max_just_send = 1500 * 3; // "mtu" * 3
  + constexpr auto def_max_just_send = 1500 * 8; // "mtu" * 8
  constexpr auto def_send_whole_blocks = true;
  constexpr auto message_header_size = 4;
  