message: net: Send post-verack handshake messages at most once
  Github-Pull:
  Rebased-From:
diff: @@ -2119,6 +2119,8 @@ bool ProcessMessage(CNode* pfrom, const std::string& msg_type, CDataStream& vRec
  if (msg_type == NetMsgType::VERACK)
  {
  + if (pfrom->fSuccessfullyConnected) return true;
  +
  pfrom->SetRecvVersion(std::min(pfrom->nVersion.load(), PROTOCOL_VERSION));
  if (!pfrom->fInbound) {
  