message: Fix segfault
  start_listen_loop used a throwing call to remote_endpoint. This caused
  an access violation.
diff: @@ -1988,7 +1988,8 @@ namespace eosio {
  if(conn->socket->is_open()) {
  if (conn->peer_addr.empty()) {
  visitors++;
  - if (paddr == conn->socket->remote_endpoint().address().to_v4()) {
  + boost::system::error_code ec;
  + if (paddr == conn->socket->remote_endpoint(ec).address().to_v4()) {
  from_addr++;
  }
  }
  