MFA Bypass: Change the error returned (#1144)

When any user tries to bypass MFA for self, before setting up the secret
key, currently "Operation Not Allowed" error is thrown. But the right
error here should be "GenerateSecretKeyRequired". All other operaions
was also returning the latter.

Tested By:
'''
PATCH -d '{"MFABypass":{"BypassTypes":["GoogleAuthenticator"]}}' https://${bmc}/redfish/v1/AccountService/Accounts/<username> -H "Content-Type: application/json"
'''

Signed-off-by: Asmitha Karunanithi <[email protected]>

redfish-core/lib/account_service.hpp

@@ -1353,7 +1353,9 @@ inline void processAccountUpdate(
     if (mfaBypass && userSession && userSession->isConfigureSelfOnly)
     {
         BMCWEB_LOG_ERROR("Bypassing MFA for self is not allowed");
-        messages::operationNotAllowed(asyncResp->res);
+        boost::urls::url accountUri = boost::urls::format(
+            "/redfish/v1/AccountService/Accounts/{}", username);
+        messages::generateSecretKeyRequired(asyncResp->res, accountUri);
         return;
     }