* md5 hash of transfered file is not faked anymore
 * implemented job cancellation
 * xfer tcp ports were not released, exhaustion was possible

- merge standard outputs
- do not return a tuple

 - server reconnection
 - vm registering
 - real TTL
 - less contention
 - super cool fixes
 - blah blah ...

every second, check that libvirt VM list is coherent with the list of host registered with the server