Change the completionhandler to accept Res

These modifications are from WIP:Redfish:Query parameters:Only
(https://gerrit.openbmc-project.xyz/c/openbmc/bmcweb/+/47474). And they
will be used in Redfish:Query Parameters:Only.
(https://gerrit.openbmc-project.xyz/c/openbmc/bmcweb/+/38952)
The code changed the completion handle to accept Res to be able to
recall handle with a new Response object.
AsyncResp owns a new res, so there is no need to pass in a res.

Tested:
1.Basic and Token auth both still work.
2.Use scripts/websocket_test.py to test websockets. It is still work
correctly.
python3 websocket_test.py --host 127.0.0.1:2443
This modification is a public part, so you can use any URL to test
this function. The response is the same as before.

Signed-off-by: zhanghaicheng <zhanghch05@inspur.com>
Change-Id: I570e32fb47a9a90fe111fcd1f4054060cd21def3
diff --git a/include/openbmc_dbus_rest.hpp b/include/openbmc_dbus_rest.hpp
index 3188188..0096e86 100644
--- a/include/openbmc_dbus_rest.hpp
+++ b/include/openbmc_dbus_rest.hpp
@@ -2233,9 +2233,7 @@
             [](const crow::Request&,
                const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
                const std::string& connection) {
-                introspectObjects(
-                    connection, "/",
-                    std::make_shared<bmcweb::AsyncResp>(asyncResp->res));
+                introspectObjects(connection, "/", asyncResp);
             });
 
     BMCWEB_ROUTE(app, "/bus/system/<str>/<path>")