message: change the user agent
diff: * for both bitcoind and bitcoin-core, to make it harder for attackers to
  * target servers or GUI users specifically.
  */
  +#ifdef BITCOIN_CASH
  +const std::string CLIENT_NAME("BUCash");
  +#else
  const std::string CLIENT_NAME("BitcoinUnlimited");
  +#endif
  // BU added
  /**
  