Disable the mempool P2P command when bloom filters disabled

Only useful to SPV peers, and attackers... like bloom is a DoS vector as far
more data is sent than received.

src/main.cpp

@@ -5277,6 +5277,13 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
 
     else if (strCommand == NetMsgType::MEMPOOL)
     {
+        if (!(nLocalServices & NODE_BLOOM) && !pfrom->fWhitelisted)
+        {
+            LogPrint("net", "mempool request with bloom filters disabled, disconnect peer=%d\n", pfrom->GetId());
+            pfrom->fDisconnect = true;
+            return true;
+        }
+
         if (CNode::OutboundTargetReached(false) && !pfrom->fWhitelisted)
         {
             LogPrint("net", "mempool request with bandwidth limit reached, disconnect peer=%d\n", pfrom->GetId());