Adds a whitelist to the iBeacon component. The whitelist allows devices without a name to be added.
To add a entry to the Whitelist call the ibeacon.whitelist_add service:
service: ibeacon.whitelist_add
data:
uuid: 407b699a-ba14-4028-83a3-220f910c8fee
Whitelist does not get written to disk, because when the entities are created the name is no longer needed.