Define "sane".
See http://linux.dell.com/files/name_eths/ for my idea of sane.
It forces the device names to ascend, starting with embeddeded NICs (in PCI
bus/dev/fn order, not random kernel order), then add-in cards by ascending slot
number (again, in PCI bus/dev/fn order).

What I'm mainly talking about here is doing something on added/removed devices ;
the current code does next to nothing.

What's needed at the minimum is assigning *a* device name (probably
first-unused), writing a config file, and deciding if we want to do
ONBOOT=(yes|no). Or doing ONLINK=(yes|no).

Fixed in 1.2.54-1; we now write:

# <description>
DEVICE=<whatever>
ONBOOT=yes
BOOTPROTO=dhcp
HWADDR=<whatever>

for all added devices, and move old configs to <name>.bak.

Also, some code added to normalize any temporary names to something sane.