Remove comment about masternode connections

This was related to the times we directly called ConnectNode from MN code

src/net.cpp

@@ -345,8 +345,6 @@ bool CConnman::CheckIncomingNonce(uint64_t nonce)
 CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure)
 {
     if (pszDest == NULL) {
-        // we clean masternode connections in CMasternodeMan::ProcessMasternodeConnections()
-        // so should be safe to skip this and connect to local Hot MN on CActiveMasternode::ManageState()
         if (IsLocal(addrConnect))
             return NULL;