log: print unexpected version warning in validation log category

Instead of printing "<n> of the last 100 blocks have unexpected version"
as a warning appended to UpdateTip, it is now printed in the validation
log category.

src/validation.cpp

@@ -2441,9 +2441,9 @@ static void UpdateTip(CTxMemPool& mempool, const CBlockIndex* pindexNew, const C
     }
 
     bilingual_str warning_messages;
+    int num_unexpected_version = 0;
     if (!::ChainstateActive().IsInitialBlockDownload())
     {
-        int nUpgraded = 0;
         const CBlockIndex* pindex = pindexNew;
         for (int bit = 0; bit < VERSIONBITS_NUM_BITS; bit++) {
             WarningBitsConditionChecker checker(bit);
@@ -2462,18 +2462,20 @@ static void UpdateTip(CTxMemPool& mempool, const CBlockIndex* pindexNew, const C
         {
             int32_t nExpectedVersion = ComputeBlockVersion(pindex->pprev, chainParams.GetConsensus());
             if (pindex->nVersion > VERSIONBITS_LAST_OLD_BLOCK_VERSION && (pindex->nVersion & ~nExpectedVersion) != 0)
-                ++nUpgraded;
+                ++num_unexpected_version;
             pindex = pindex->pprev;
         }
-        if (nUpgraded > 0)
-            AppendWarning(warning_messages, strprintf(_("%d of last 100 blocks have unexpected version"), nUpgraded));
     }
     LogPrintf("%s: new best=%s height=%d version=0x%08x log2_work=%f tx=%lu date='%s' progress=%f cache=%.1fMiB(%utxo)%s\n", __func__,
       pindexNew->GetBlockHash().ToString(), pindexNew->nHeight, pindexNew->nVersion,
       log(pindexNew->nChainWork.getdouble())/log(2.0), (unsigned long)pindexNew->nChainTx,
       FormatISO8601DateTime(pindexNew->GetBlockTime()),
       GuessVerificationProgress(chainParams.TxData(), pindexNew), ::ChainstateActive().CoinsTip().DynamicMemoryUsage() * (1.0 / (1<<20)), ::ChainstateActive().CoinsTip().GetCacheSize(),
       !warning_messages.empty() ? strprintf(" warning='%s'", warning_messages.original) : "");
+
+    if (num_unexpected_version > 0) {
+        LogPrint(BCLog::VALIDATION, "%d of last 100 blocks have unexpected version\n", num_unexpected_version);
+    }
 }
 
 /** Disconnect m_chain's tip.