Title: #132: Add "Wants=" to sssd unit and avoid PAC responder to be always
Okay, you don't agree with the second patch and I'm totally fine about that (in
case other developers don't agree as well). So, we can just drop it without any
However, this PR also inclyudes the first patch, which is important and I'd like to
have it reviewed.
See the full comment at https://github.com/SSSD/sssd/pull/132#issuecomment-274772147