Remove fNetworkNode.

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

src/net.cpp

@@ -1067,8 +1067,7 @@ void CConnman::ThreadSocketHandler()
                     pnode->CloseSocketDisconnect();
 
                     // hold in disconnected pool until all refs are released
-                    if (pnode->fNetworkNode || pnode->fInbound)
-                        pnode->Release();
+                    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;