AddressInfo: Add flags argument, and f_nodevice.

f_nodevice means don't look up this address in the device table.
EtherAddressArg: Take a flags argument for AddressInfo.

E.g., AddressInfo::f_nodevice.
Use EtherAddressArg(AddressInfo::f_nodevice) in linuxmodule device lookup.

Asa Zernik report.