dhcp on ethN instead of eth0

[mathieu.geli at gmail.com (Mathieu GELI)]

Here is a beginning, I wonder what others think about replacing
"debian-live" with the Documentation/nfsroot.txt syntax a little bit
extended with possibility to chain devices declarations.

What's done is :
1) get what interface has to be used for dhcp (first found, the one
used) in scripts/live, just before mounting rootfs.
2) auto-fill /etc/network/interfaces from scripts/live-bottom/23networking

device_declaration :
<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>

ip=<device_declaration1>,<device_declaration2>,...

e.g :
append [...] ip=10.0.0.1::10.0.0.254:255.255.255.0::eth0,:::::eth1:dhcp

-- 
Mathieu
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