'Return a nodename which uniquely describes a cluster.
The name will be of the form:
<mo id>.<vcenter uuid>
e.g.
domain-26.9d51f082-58a4-4449-beed-6fd205a5726b'

def _create_nodename(self, mo_id):

    return ('%s.%s' % (mo_id, self._vcenter_uuid))
