message: keypair: cli arg has priority over cfg & env
diff: @@ -238,7 +238,10 @@ int main(int argc, char *argv[]) {
  daemon_status_notifier->notify(
  ::iroha::utility_service::Status::kInitialization);
  - auto keypair = config.crypto
  + BOOST_ASSERT_MSG(not FLAGS_keypair_name.empty() or config.crypto,
  + "keypair must be specified somewhere");
  +
  + auto keypair = FLAGS_keypair_name.empty()
  ? getKeypairFromConfig(config.crypto.value())
  : getKeypairFromFile(FLAGS_keypair_name, log_manager);
  