Security update for libvirt

This update for libvirt fixes the following issues:

- Update to libvirt 1.2.18.4 stable release
- Inherit many upstream bug fixes, including CVE-2016-5008
boo#987527. For details, see
http://wiki.libvirt.org/page/Maintenance_Releases

- virsh: improve waiting for block job readines (boo#989755)

Fixed bugs
bnc#989755
virsh blockcommit fails
bnc#987527
empty VNC password disables authentication
Selected Binaries
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