Remove fNetworkNode.

Matt pointed out to me that this appeared to be doing nothing (except involving itself in data races).

src/main.cpp

@@ -5242,8 +5242,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
     {
         pfrom->SetRecvVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
 
+        if (!pfrom->fInbound) {
             // Mark this node as currently connected, so we update its timestamp later.
-        if (pfrom->fNetworkNode) {
             LOCK(cs_main);
             State(pfrom->GetId())->fCurrentlyConnected = true;
         }

src/net.cpp

@@ -1067,7 +1067,6 @@ void CConnman::ThreadSocketHandler()
                     pnode->CloseSocketDisconnect();
 
                     // hold in disconnected pool until all refs are released
-                    if (pnode->fNetworkNode || pnode->fInbound)
                     pnode->Release();
                     vNodesDisconnected.push_back(pnode);
                 }
@@ -1808,7 +1807,6 @@ bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFai
         return false;
     if (grantOutbound)
         grantOutbound->MoveTo(pnode->grantOutbound);
-    pnode->fNetworkNode = true;
     if (fOneShot)
         pnode->fOneShot = true;
     if (fFeeler)
@@ -2531,7 +2529,6 @@ CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn
     fOneShot = false;
     fClient = false; // set by version message
     fFeeler = false;
-    fNetworkNode = false;
     fSuccessfullyConnected = false;
     fDisconnect = false;
     nRefCount = 0;

src/net.h

@@ -613,7 +613,6 @@ public:
     bool fOneShot;
     bool fClient;
     const bool fInbound;
-    bool fNetworkNode;
     bool fSuccessfullyConnected;
     bool fDisconnect;
     // We use fRelayTxes for two purposes -