Added test cases for GUI factory reset sub menu

Test cases added:
    - Verify Navigation To Factory Reset Page
    - Verify Existence Of All Sections In Factory Reset Page
    - Verify Existence Of All Buttons In Factory Reset Page

Signed-off-by: Rahul Maheshwari <rahulmaheshwari@in.ibm.com>
Change-Id: I8934facf2aeef92493a3918722fc59dc1ad584f1
diff --git a/gui/data/gui_variables.py b/gui/data/gui_variables.py
index 8911566..c00f740 100644
--- a/gui/data/gui_variables.py
+++ b/gui/data/gui_variables.py
@@ -36,6 +36,7 @@
 
     # Control menu
     xpath_control_menu = "//*[@data-test-id='nav-button-control']"
+    xpath_factory_reset_sub_menu = "//*[@data-test-id='nav-item-factory-reset']"
     xpath_manage_power_usage_sub_menu = "//*[@data-test-id='nav-item-manage-power-usage']"
     xpath_reboot_bmc_sub_menu = "//*[@data-test-id='nav-item-reboot-bmc']"
     xpath_server_led_sub_menu = "//*[@data-test-id='nav-item-server-led']"