[oe] RFC: auto eth0 and auto eth1 in netbase

[Rod Whitby]

Some machines don't have consoles, so the only way to access them on the
first boot after a reflash is via the network.

Of course, an 'auto' keyword is required for this, and netbase currently
has none.

Is there any reason why at least eth0 should not have an 'auto' keyword?

Should this be OE-wide, only for Angstrom (koen thinks eth0 and eth1
should be auto), or only for specific machines (in which case, does
anyone object to ixp4xx having auto eth0)?

-- Rod