Added test case for GUI client session sub menu

Test cases added:
    - Verify Navigation To Client Sessions Page

Change-Id: I80a6d6311677ae0dbce12ec70fcd8fd70d8f821b
Signed-off-by: Rahul Maheshwari <rahulmaheshwari@in.ibm.com>
diff --git a/gui/data/gui_variables.py b/gui/data/gui_variables.py
index 32f5fbb..8911566 100644
--- a/gui/data/gui_variables.py
+++ b/gui/data/gui_variables.py
@@ -51,6 +51,7 @@
 
     # Access control menu
     xpath_access_control_menu = "//*[@data-test-id='nav-button-access-control']"
+    xpath_client_sessions_sub_menu = "//*[@data-test-id='nav-item-client-sessions']"
     xpath_ldap_sub_menu = "//*[@data-test-id='nav-item-ldap']"
     xpath_save_settings_button = "//button[contains(text(),'Save settings')]"
     xpath_local_user_management_sub_menu = "//*[@data-test-id='nav-item-local-user-management']"