GUI: Added Redfish Login and Logout

Change:
    - Added Redfish.Login and added Redfish.Logout in the test case

Tested:

    - Ran successfully test_snmp_alerts_sub_menu.robot

Change-Id: I0bc0099de367daea70d2f4ac4d4db606f498fde9
Signed-off-by: rramyasr-in <rramyasr@in.ibm.com>
diff --git a/gui/gui_test/settings_menu/test_snmp_alerts_sub_menu.robot b/gui/gui_test/settings_menu/test_snmp_alerts_sub_menu.robot
index a51945f..1aca1ad 100644
--- a/gui/gui_test/settings_menu/test_snmp_alerts_sub_menu.robot
+++ b/gui/gui_test/settings_menu/test_snmp_alerts_sub_menu.robot
@@ -76,8 +76,9 @@
 
     Wait Until Page Contains  ${SNMP_MGR1_IP}  timeout=45s
 
+    Redfish.Login
     Verify SNMP Manager Configured On BMC  ${SNMP_MGR1_IP}  ${NON_DEFAULT_PORT1}
-
+    Redfish.Logout
 
 Configure SNMP Settings On BMC Via GUI And Verify
     [Documentation]  Configure SNMP settings on BMC via GUI and verify.