Thanks for the idea Ivan A. Melnikov.

Those few places lacking "; @:" replacement for a real recipe
have been finally -spotted- identified with `make check'
and fixed.

This has been simply use/net but it looks like we've got
some people who would like to cope without etcnet, even:
http://lists.altlinux.org/pipermail/devel/2015-February/199506.html

Adjust its usage accordingly.

"use/stage2/net-eth use/net-eth" would be common enough
for installers or livecd images to just get these pulled in
together by a convenient shortcut thus reducing confusion
and chances to just forget one of these counterparts.

Just in case adding use/net-eth -> use/stage2/net-eth dependency
ever seems a good idea...

This feature intrinsically depends on predictable
ethernet interface names and makes no sense without
those; so it only seems reasonable to bring this
nice package in, huge thanks go to shaba@ of course.

This one is also putting an end to an overly long lived hack
named vm-net by replacing it with a bit more generic mechanism.