Begin removing several dependencies on Config object

gateway/gatewayfactory.cpp

@@ -24,5 +24,16 @@ SOFTWARE.
 
 std::unique_ptr<GatewayInterface> createGateway(const Config &c)
 {
-	return std::make_unique<HttpGateway>(c);
+	std::string listenaddr = c.configVarResolver.getConfig("http.listenaddr");
+	if(listenaddr.empty())
+	{
+		throw new std::runtime_error("No http.listenaddr in config file");
+	}
+	std::string listenport = c.configVarResolver.getConfig("http.listenport");
+	if(listenport.empty())
+	{
+		throw new std::runtime_error("No http.listenport in config file");
+	}
+
+	return std::make_unique<HttpGateway>(listenaddr, std::stoi(listenport), c.max_payload_length);
 }