message: Generate log entry when blocks messages are received unexpectedly.
diff: @@ -2540,8 +2540,14 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
  return true;
  }
  - if (strCommand == NetMsgType::CMPCTBLOCK && !fImporting && !fReindex) // Ignore blocks received while importing
  + if (strCommand == NetMsgType::CMPCTBLOCK)
  {
  + // Ignore cmpctblock received while importing
  + if (fImporting || fReindex) {
  + LogPrint(BCLog::NET, "Unexpected cmpctblock message received from peer %d\n", pfrom->GetId());
  + return true;
  + }
  +
  CBlockHeaderAndShortTxIDs cmpctblock;
  vRecv >> cmpctblock;
  @@ -2761,8 +2767,14 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
  return true;
  }
  - if (strCommand == NetMsgType::BLOCKTXN && !fImporting && !fReindex) // Ignore blocks received while importing
  + if (strCommand == NetMsgType::BLOCKTXN)
  {
  + // Ignore blocktxn received while importing
  + if (fImporting || fReindex) {
  + LogPrint(BCLog::NET, "Unexpected blocktxn message received from peer %d\n", pfrom->GetId());
  + return true;
  + }
  +
  BlockTransactions resp;
  vRecv >> resp;
  @@ -2836,8 +2848,14 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
  return true;
  }
  - if (strCommand == NetMsgType::HEADERS && !fImporting && !fReindex) // Ignore headers received while importing
  + if (strCommand == NetMsgType::HEADERS)
  {
  + // Ignore headers received while importing
  + if (fImporting || fReindex) {
  + LogPrint(BCLog::NET, "Unexpected headers message received from peer %d\n", pfrom->GetId());
  + return true;
  + }
  +
  std::vector<CBlockHeader> headers;
  // Bypass the normal CBlock deserialization, as we don't want to risk deserializing 2000 full blocks.
  @@ -2861,8 +2879,14 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
  return ProcessHeadersMessage(pfrom, connman, headers, chainparams, should_punish);
  }
  - if (strCommand == NetMsgType::BLOCK && !fImporting && !fReindex) // Ignore blocks received while importing
  + if (strCommand == NetMsgType::BLOCK)
  {
  + // Ignore block received while importing
  + if (fImporting || fReindex) {
  + LogPrint(BCLog::NET, "Unexpected block message received from peer %d\n", pfrom->GetId());
  + return true;
  + }
  +
  std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
  vRecv >> *pblock;
  