- docker-p8 is a docker with p8 (starterkit) branding

...into cinnamon and lxde flavours; it got dropped out from
regular builds but this file controls p8-based starterkits
specifically!

PS: looks like unikey can get configured but either fails
    to actually work or I forgot how to use it already...

Suggested-by: Alexey Shabalin <shaba@altlinux.org>

This has been prepared with immense help by sem@ and our users:
http://forum.altlinux.org/index.php?topic=36177.msg299358#msg299358
(well that's the xfce-sysv livecd, sysv-xfce is pure installer
geared to replace sysv-tde for starterkits due to regressions
within the latter).

No need to shorten most of the image names now due to #28271:
"ALT" prefix is 6 bytes shorter than "ALT Linux" and this
changes a lot for these particular names (<= 32-byte long)!

This is hopefully the final change regarding trademark
related commit "series" tracking change from ALT Linux
to BaseALT and now to ALT; starterkits get this too.

pve-* packages have just hit p8/branch as well.

Unlike back in Dec 2015, we do have p8/branch now.

Basically an updated p7.mk.