Add username and ip logging for RPC method requests

src/rpc/server.h

@@ -45,6 +45,7 @@ public:
     bool fHelp;
     std::string URI;
     std::string authUser;
+    std::string peerAddr;
 
     JSONRPCRequest() : id(NullUniValue), params(NullUniValue), fHelp(false) {}
     void parse(const UniValue& valRequest);