Bug#535008: configure_networking: support BOOTIF variable set by pxelinux

[Gabor Gombas <gombasg@sztaki.hu>]

Hi,

<aol>Mee too!</aol> It'd be really nice to have this integrated.

To add something constructive, mdadm, and lvm2 scripts already use sed
without checking for it or making sure that it is available, so the use
of sed should not be a problem. cryptsetup also uses sed but it at least
forces "BUSYBOX=y". IMHO it should be enough to document that "BOOT=nfs"
requires "BUSYBOX=y".

Gabor

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     MTA SZTAKI Computer and Automation Research Institute
                Hungarian Academy of Sciences
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