This update for libvirt fixes the following issues:

- libvirtd augeas lens: Parse negative values. (boo#975729)
- spec: Restart daemons in %posttrans after connection drivers
have been processed (boo#854343, boo#968483)
- libxl: Support parsing and formatting vif bandwidth (boo#960305)
- libxl: Add support for block-{dmmd,drbd,npiv} scripts (boo#954872)
- Remove "Wants=xencommons.service" from libvirtd service file (boo#964465)