This is more appropriate name and is propagated trough updater up to
Foris now so this was only place where is was still called userlist
primarily and not pkglist.

Kittens were specified invalidly as stable. Those should have been
turtles.

This reverts commit 45945dff.

Upstream does not have it but we use it so we have to have it.

Updater support run from relative root and UCI can be pointet to
non-standard configuration directory. Together with those two features
we can use UCI even if we run updater relative to non-default root.

We should be able to use python-periphery instead.

It is no longer needed as it is not installed as part of updater-ng
package.

This postins now contains only service enablement and that happens
automatically so there is no point in having this script.

Init script for updater was moved in source repository. We also on this
occasion are renaming this script to more appropriate name.

This adds support for Turris OS 4.x to updater and allows our pkglists
to be relatively independent on server path.

I have no idea why originaly knot user was specified but init script
uses kresd. I renamed it later to knot-resolver to fix compilation but
that causes kresd to not start. Correct value is kresd (same as is in
init script).

Without bzip2 backup is created, but it's empty.