[archiso] Add support to setups with more than one network card.
[archiso] Add support to setups with more than one network card.

Otherwise archiso_pxe_nbd hook can configure the incorrect network card,
because ipconfig will configure all interfaces available.

Signed-off-by: Gerardo Exequiel Pozzi <f366e24919a755584052c42c8303af2b142d3e55@yahoo.com.ar>

dock0/dock0