net: pass CConnman via pointer rather than reference

There are a few too many edge-cases here to make this a scripted diff.

The following commits will move a few functions into PeerLogicValidation, where
the local connman instance can be used. This change prepares for that usage.

src/net.cpp

@@ -1114,7 +1114,7 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
     CNode* pnode = new CNode(id, nLocalServices, GetBestHeight(), hSocket, addr, CalculateKeyedNetGroup(addr), nonce, addr_bind, "", true);
     pnode->AddRef();
     pnode->fWhitelisted = whitelisted;
-    GetNodeSignals().InitializeNode(pnode, *this);
+    GetNodeSignals().InitializeNode(pnode, this);
 
     LogPrint(BCLog::NET, "connection from %s accepted\n", addr.ToString());
 
@@ -1966,7 +1966,7 @@ bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFai
     if (fAddnode)
         pnode->fAddnode = true;
 
-    GetNodeSignals().InitializeNode(pnode, *this);
+    GetNodeSignals().InitializeNode(pnode, this);
     {
         LOCK(cs_vNodes);
         vNodes.push_back(pnode);
@@ -1996,15 +1996,15 @@ void CConnman::ThreadMessageHandler()
                 continue;
 
             // Receive messages
-            bool fMoreNodeWork = GetNodeSignals().ProcessMessages(pnode, *this, flagInterruptMsgProc);
+            bool fMoreNodeWork = GetNodeSignals().ProcessMessages(pnode, this, flagInterruptMsgProc);
             fMoreWork |= (fMoreNodeWork && !pnode->fPauseSend);
             if (flagInterruptMsgProc)
                 return;
 
             // Send messages
             {
                 LOCK(pnode->cs_sendProcessing);
-                GetNodeSignals().SendMessages(pnode, *this, flagInterruptMsgProc);
+                GetNodeSignals().SendMessages(pnode, this, flagInterruptMsgProc);
             }
             if (flagInterruptMsgProc)
                 return;

src/net.h

@@ -441,9 +441,9 @@ struct CombinerAll
 // Signals for message handling
 struct CNodeSignals
 {
-    boost::signals2::signal<bool (CNode*, CConnman&, std::atomic<bool>&), CombinerAll> ProcessMessages;
-    boost::signals2::signal<bool (CNode*, CConnman&, std::atomic<bool>&), CombinerAll> SendMessages;
-    boost::signals2::signal<void (CNode*, CConnman&)> InitializeNode;
+    boost::signals2::signal<bool (CNode*, CConnman*, std::atomic<bool>&), CombinerAll> ProcessMessages;
+    boost::signals2::signal<bool (CNode*, CConnman*, std::atomic<bool>&), CombinerAll> SendMessages;
+    boost::signals2::signal<void (CNode*, CConnman*)> InitializeNode;
     boost::signals2::signal<void (NodeId, bool&)> FinalizeNode;
 };