[packaging] Fix rpm preun/post/postun scripts.

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>
[packaging] Do not restart dbus on post.

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>
Merge pull request #4 from mer-packages/packaging

[packaging] Fix rpm preun/post/postun scripts.