code: def get_fw_policy(self, policy_id):
          
          policy = None
          try:
              policy = self.neutronclient.show_firewall_policy(policy_id)
          except Exception as exc:
              LOG.error("Failed to get firewall plcy for id %(id)s "
                        "Exc %(exc)s",
                        {'id': policy_id, 'exc': str(exc)})
          return policy
docs: Return the firewall policy, given its ID.