Merge from Perforce
Add the Bonjour Gateway test cases:
1. Configure zone with bonjour gateway enable.
2. Configure zone with bonjour gateway policies.
3. Show bonjour gateway list.
4. Show bonjour gateway list detail.
Add the Bonjour Gateway test cases:
1. Bind AP with a Bonjour policy
2. Configure zone with user-defined bonjour gateway policies
3. Bind AP with another Bonjour policy
Add the Bonjour Gateway test cases:
1. Modify the bonjour gateway policy.
2. Deny delete operation if bonjour policy is referenced by AP.
3. Detach bonjour policy from AP.
4. Delete bonjour policy from a zone.
5. Configure zone with bonjour gateway disable.
Add the Bonjour Gateway test cases:
 1. Check AP VLAN interface after binding with a bonjour poilicy.
 2. Check AP VLAN interface after modifying the bonjour gateway policy.