Bug#703744: live-boot: Select BOOTIF device for real root network mount if defined

[Daniel Baumann <daniel.baumann@progress-technologies.net>]

thanks, applied as is except for the sourcing of *-networking.sh in
*-select-eth-device.sh, as live-boot sources all scripts in
/lib/live/boot/ automatically already anyway.

-- 
Address:        Daniel Baumann, Donnerbuehlweg 3, CH-3012 Bern
Email:          daniel.baumann@progress-technologies.net
Internet:       http://people.progress-technologies.net/~daniel.baumann/