test: Simplify `system_before()`
test: Simplify `system_before()`

I don't recall how this was supposed to work. I think that it was
supposed to work with point releases. We don't use that anywhere and it
does not work as expected with current release, so just drop unused
parts.

If we need one day to lock on point release than we can implement this
in more robust fashion.

mvollmer/cockpit,cockpit-project/cockpit,garrett/cockpit,martinpitt/cockpit,martinpitt/cockpit,garrett/cockpit,mvollmer/cockpit,cockpit-project/cockpit,mvollmer/cockpit,cockpit-project/cockpit,martinpitt/cockpit,martinpitt/cockpit,garrett/cockpit,mvollmer/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpit-project/cockpit,garrett/cockpit,garrett/cockpit,mvollmer/cockpit