We want to retain *some* of the full paths in order to test more code paths.
But the default should be to use the command name only. This makes the tests
less visually cluttered.
In my understanding user group "3" (aka "sys") is kept for historical reasons
but not really useful these days. That's probably explained why this group
isn't defined on openSUSE.
Hence let's drop reference to this user group, this shouldn't lessen the
revelance of the test since SupplementaryGroups= is still tested with 2 other
groups.
Those are all consumed by our parser, so they all support comments.
I was considering whether they should have a license header at all,
but in the end I decided to add it because those files are often created
by copying parts of real unit files. And if the real ones have a license,
then those might as well. It's easier to add it than to make an exception.
