The autostart under session daemon might not behave as you'd
expect it to behave. This patch is inspired by latest
libvirt-users discussion:

https://www.redhat.com/archives/libvirt-users/2018-December/msg00047.htmlSigned-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>