This rewrites the MAC address generation logic to distinguish between
MAC addresses assigned to a wireless interface or virtual / wired
interfaces.
Each radio is now assigned a range of SSIDs, allowing for up to 8 SSIDs
per radio. Previosuly, there were 8 MAC addresses total for the entire
device.
To keep compatibility on already deployed nodes, MAC addresses for wired
/ virtual interfaces stay unchanged.
This change is required to support nodes with more than 2 radios.
It also allows us to increase the number of VAPs per radio.
