Bug#795494: udev: Interface is incorrectly renamed at boot, outdated nonexistent name used

[Vladimir K]

> That sounds like you have an outdated udev rule in the initramfs, which
> renames your interface.
> Please run "update-initramfs -u" and then test again.

That seem to be the case, thank you!

Digging a bit deeper, I now think that udev's README should be updated and
initramfs-tools should somehow be tweaked:
Interface naming rules go to initramfs only if the rule is named 70-persistent-net.rules,
but udev's README suggests making a custom file with 75>prefix>80. Such rule
would not get into initramfs as of current Debian testing.