Since we are hitting this bug :
https://bugzilla.redhat.com/show_bug.cgi?id=1324587
eg:
`failed: internal error: Monitor path /var/lib/libvirt/qemu/domain-bs-docker-cl
uster-dmcrypt-journal-collocation_mon0_1499294943_ba9faf7bf296533177f6/monitor.
sock too big for destination`
and we can't upgrade libvirt in our CI for some reason
we need to get the directories name shorter in order to workaround this
issue
Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>