Handle /usr/lib/os-release if it exists.

Handle dangling symlinks.

After switching to these symlinks, you no longer need to create
the missing directories.
See-also: https://bugzilla.altlinux.org/show_bug.cgi?id=35350

Not needed for polkit-sysvinit >= 0.4

Install /etc/*-release files if needed.
Reported-by: Ivan A. Melnikov <iv@altlinux.org>

autofs4.ko is not available on Tavolga, and might be unavailable
elsewhere as well (or vice versa, might become available).

This reverts commit b75b2cc3.

See-also: https://lists.altlinux.org/pipermail/devel/2019-November/208963.html

Let's provide some shim until directory migration is over.

This was erroneously added to overly broad class of images.

It was dropped from make-initrd back in 2012:
http://git.altlinux.org/gears/m/make-initrd.git?p=make-initrd.git;a=commitdiff;h=853eed35ea72cf5a6409ef7f465f76da4f5dd097

filesystem package has been severely broken in sisyphus
since late August unfortunately, and I was too busy to
even notice that for too long; let's plug this kludge
until it's fixed now that I've finally seen that crap :-/

See-also: https://bugzilla.altlinux.org/35350

The issue at hand it _nmconnect group that's supported
in ALT NM for polkit-less cases; it has to be added
*before* 50-users hook from deflogin feature fires off.

The existing systemd-related hook has been renamed
to reflect its job better.

This one is finally there and should help reduce the
systemd-induced mess in package lists and specifications.