docs: def get_kerberos_subs(netid):
      """
      Return a restclients.models.uwnetid.Subscription objects
      on the given uwnetid
      """
      subs = get_netid_subscriptions(netid, Subscription.SUBS_CODE_KERBEROS)
      if subs is not None:
          for subscription in subs:
              if subscription.subscription_code == Subscription.SUBS_CODE_KERBEROS:
                  return subscription
      return None