Code review comment for lp://qastaging/~bogdana/landscape-client/save-aptsources

@Danilo, thanks for the suggestions, they should all be implemented now.
@Adam, while I agree that this solution isn't foolproof, I feel that making the server store the files would require a bigger change. And as Danilo said, since we've already been doing this for the files in sources.list.d, it might be worth investigating if any clients ever complained about it before making the improvement.