message: fix reconnection sync crash and bump the sync fetch span to 100 blocks
diff: @@ -285,7 +285,7 @@ namespace eosio {
  constexpr auto def_conn_retry_wait = 30;
  constexpr auto def_txn_expire_wait = std::chrono::seconds(3);
  constexpr auto def_resp_expected_wait = std::chrono::seconds(1);
  - constexpr auto def_sync_rec_span = 10;
  + constexpr auto def_sync_rec_span = 100;
  constexpr auto def_max_just_send = 1300 * 3; // "mtu" * 3
  constexpr auto def_send_whole_blocks = true;
  @@ -632,7 +632,6 @@ namespace eosio {
  out_queue.clear();
  if(response_expected) {
  response_expected->cancel();
  - response_expected.reset();
  }
  pending_message_buffer.reset();
  }
  