Change the completionhandler to accept Res

These modifications are from WIP:Redfish:Query parameters:Only
(https://gerrit.openbmc-project.xyz/c/openbmc/bmcweb/+/47474). It will
be used in future CLs for Query Parameters.

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.

Also fixed a self-move assignment bug.

Context:
Originally submitted:
https://gerrit.openbmc-project.xyz/c/openbmc/bmcweb/+/480020

Reveted here:
https://gerrit.openbmc-project.xyz/c/openbmc/bmcweb/+/48880

Because of failures here:
https://gerrit.openbmc-project.xyz/c/openbmc/openbmc/+/48864

Tested:
1. Romulus QEMU + Robot tests; all passed
2. Use scripts/websocket_test.py to test websockets. It is still work correctly.
3. Tested in real hardware; no new validator errors; tested both
   authless, session, and basic auth.
4. Hacked codes to return 500 errors on certain resource; response is
   expected;
5. Tested Eventing, the push style one (not SSE which is still under
   review), worked as expected.
6. Tested 404 errors; response is expected.

Signed-off-by: Nan Zhou <nanzhoumails@gmail.com>
Signed-off-by: John Edward Broadbent <jebr@google.com>
Change-Id: I52adb174476e0f6656335baa6657456752a031be
diff --git a/http/websocket.hpp b/http/websocket.hpp
index daa5100..bd7b841 100644
--- a/http/websocket.hpp
+++ b/http/websocket.hpp
@@ -199,10 +199,10 @@
     {
         BMCWEB_LOG_DEBUG << "Websocket accepted connection";
 
-        auto asyncResp = std::make_shared<bmcweb::AsyncResp>(
-            res, [this, self(shared_from_this())]() { doRead(); });
+        auto asyncResp = std::make_shared<bmcweb::AsyncResp>();
 
         asyncResp->res.result(boost::beast::http::status::ok);
+        doRead();
 
         if (openHandler)
         {