net: Set feelers to disconnect at the end of the version message

This way we're not relying on messages going out after fDisconnect has been
set.

This should not cause any real behavioral changes, though feelers should
arguably disconnect earlier in the process. That can be addressed in a later
functional change.

src/main.cpp

@@ -5086,12 +5086,6 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
 
     if (strCommand == NetMsgType::VERSION)
     {
-        // Feeler connections exist only to verify if address is online.
-        if (pfrom->fFeeler) {
-            assert(pfrom->fInbound == false);
-            pfrom->fDisconnect = true;
-        }
-
         // Each connection can only send one version message
         if (pfrom->nVersion != 0)
         {
@@ -5227,6 +5221,12 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
         int64_t nTimeOffset = nTime - GetTime();
         pfrom->nTimeOffset = nTimeOffset;
         AddTimeData(pfrom->addr, nTimeOffset);
+
+        // Feeler connections exist only to verify if address is online.
+        if (pfrom->fFeeler) {
+            assert(pfrom->fInbound == false);
+            pfrom->fDisconnect = true;
+        }
     }