network: Write a flag that can be used as a trigger for udev

udev might detect network interfaces that in turn check to see
if the network subsystem is ready. It did this via checking
a file in /var/lock, but this is not a good idea if that file
system tree is messy from a previous boot.

The (separate) cleaning process has to run after udev (because
udev may be needed to mount /var filesystem) and thus we have
to use a different flag until /var/lock is on a tmpfs.

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