Logical Interfaces can be assigned a hardware address allowing them
to match on MAC address. The static config method also needs to
support specifying multiple addresses.
Until support for bonding params is added to networkd, this will be
neccessary in order to use bonding parameters (i.e. miimon, mode).
This also makes it such that the 8012q module will only be loaded if
the network config makes use of VLANs.
