Add fix for boo#987668. Supercedes request #405937.

- systemd: fix ready notification on abstract socket
c8f08e48-systemd-notify-fix.patch
boo#987668

- Update to libvirt 2.0.0
- Change version scheme to match libvirt's time-driven release
schedule. will be incremented on first release of
new calendar year, on each monthly release, and
on stable branch maintenance release
- Include libvirt-admin utility and API
- Many incremental improvements and bug fixes, see
http://libvirt.org/news.html
- Dropped patches:
apparmor-dont-scrub-environment-of-virtlogd-process.patch,
e33cd67a-xenconfig-backendtype-fix.patch