Fixed message reporting wrong service handler after switching to systemd (FATE #312568)

I know this is not the best solution but Service module doesn't provide any API for getting the last command called (and last out/err either) which would be nice but impossible without quite a big refactoring of that module.

And if we want to do the refactoring, it would be better to do it in Ruby or Python. And ruby bindings currently do not work might not be fixed for openSUSE 12.3.