CLOUD: Change Request::handle()

With new ConnectionManager upgrade Requests indicate that they are
finished with RequestInfo.state. No need to use handle() return value
anymore.

backends/networking/curl/curljsonrequest.h

@@ -40,7 +40,7 @@ public:
 	CurlJsonRequest(DataCallback cb, const char *url); //TODO: use some Callback<JSON> already
 	virtual ~CurlJsonRequest();
 
-	virtual bool handle();
+	virtual void handle();
 };
 
 }  //end of namespace Networking