Over time, the openshift-installs we do on libvirt leave behind disk artifacts.
to clean this up, we occasionally have to run:
find /var/lib/libvirt/openshift-images -depth -type d -mmin +$((60*24)) -exec /bin/rm -rf {} \;
We should set this up as a weekly chron and host it in https://github.com/openshift/ocp-remote-ci