 finds the hosts on which the VMs are
running, permutes the list of hosts and then simultaneously migrates each VM to
the chosen new host. The program waits for all parallel migration tasks to complete before
continuing. <b>NB</b> this program
requires an extra argument: an integer number of iterations.

<h3>vm_start_async.py</h3>
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<p>
This example demonstrates the asyncronous operation support by starting a VM
     