Updated old keyword to Power Off Server new keyword

Change-Id: I083c51acb87f338d216b96f719e336ac9f23a6ee
Signed-off-by: rramyasr in <rramyasr@in.ibm.com>
diff --git a/gui/gui_test/settings_menu/test_date_and_time_sub_menu.robot b/gui/gui_test/settings_menu/test_date_and_time_sub_menu.robot
index 8a66bcc..9139484 100644
--- a/gui/gui_test/settings_menu/test_date_and_time_sub_menu.robot
+++ b/gui/gui_test/settings_menu/test_date_and_time_sub_menu.robot
@@ -263,7 +263,7 @@
    [Documentation]  Power off system if not powered off and go to date and
    ...  time page.
 
-   Redfish Power off  stack_mode=skip
+   Power Off Server
    Navigate To Date and Time Page
 
 Navigate To Date and Time Page