Return a restclients.models.uwnetid.Subscription objects
    on the given uwnetid

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