copr-be: automatically cleanup VMs (not)started by resalloc
    
    For some reason, starting VMs sometimes fails and VM is kept idling on
    in our VMs list, and we are accounted for it.  This script periodically
    checks the list of started VMs and terminates those which we are not
    interested in.
    
    The script requires, except for python3, also python3-dateutil.