[libvirt] Lxc support

[Serge Hallyn]

Quoting Jean-Philippe Menil (jean-philippe.menil at univ-nantes.fr):
> 10:41:10.076: error : lxcContainerStart:858 : Failed to run clone
> container: Operation not permitted

I would guess that the libvirt process creating the container has dropped some
of the needed capabilities (CAP_SYS_ADMIN and a few others).  Is libvirtd
running as root?  What does /proc/$$/status for that process show?