[libvirt] another AUTHORS update

Eduardo Otubo contacted me off-list, noticing that his name was not yet in AUTHORS even though he has had commits in the past. I've rectified this situation with an obvious commit; not worth posting the diff to the list (to avoid unnecessary exposure of all the email addresses...). -- Eric Blake eblake(a)redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org