Cover the order that names the install device: installnic, then primarynic,
then mac.mac. Either attribute may name an interface or carry an address, and
the keyword mac returns to mac.mac.
Cover the device the kickstart names for each of those inputs. A node that
sets neither attribute keeps the address it has today. Cover the defect the
change closes, where a mac.mac entry that holds several untagged addresses
resolves to the last of them.
Cover that Ubuntu keeps its own pair of a name and an address over the same
resolution, and that the unique local address still comes from the hardware
address.