libvirtd connects on UNIX socket

Use this command to create the container:

sudo docker run --rm --privileged --net=host -ti -e 'container=docker' -v /proc/modules:/proc/modules -v /run/libvirt:/host_run/libvirt  -v /var/lib/libvirt/:/var/lib/libvirt/ -v /sys/fcgroup:/sys/fs/cgroup:rw libvirtd

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>