Failover test

1. From the Client side, request VIP 10.159.33.200.
   
2. Log in to the primary device's GUI, you should see traffic go through.
   
3. Log in to the secondary device's GUI, there should be no traffic passing.
   
4. Change the Secondary device’s priority to 1 so that it could take over as primary device.
5. Log in to the former primary device’s GUI. You should see that its role change to secondary and there isn't traffic passing.