Add the WLAN scheduler test cases:
 1. Create WLAN scheduler.
 2. Show WLAN scheduler list.
 3. Show WLAN scheduler list detail.
 4. Associate WLAN scheduler in WLAN configuration.
 5. Show WLAN scheduler in WLAN configuration.
 6. Deny delete operation if WLAN scheduler is referenced by WLAN.
 7. Delete WLAN scheduler.
Rename the SZ_DevicePolicy.html file to SZ_Device_Policy.html