code: def close_node(self, node_id, *args, **kwargs):
          
  
          node = self.get_node(node_id)
          if node_id in self._used_mac_ids:
              i = self._used_mac_ids[node_id]
              self._free_mac_ids[node.project.id].insert(0, i)
              del self._used_mac_ids[node_id]
          yield from super().close_node(node_id, *args, **kwargs)
          return node
docs: Closes a VPCS VM.
  
          :returns: VPCSVM instance