def revert_snapshots(self, name):
     vec = [
         functools.partial(vm.revert_snapshot, name)
         for vm in self._vms.values()
     ]
     vt = utils.VectorThread(vec)
     vt.start_all()
     vt.join_all()
 def bootstrap(self):
     vec = [vm.bootstrap for vm in self._vms.values()]
     vt = utils.VectorThread(vec)
     vt.start_all()
     vt.join_all()