Find an SRV service in a domain or it's parents
    :param svc: service to find (ldap, 389, etc)
    :param proto: protocol the service talks (tcp, udp, etc)
    :param domain: domain to start search in
    :param walk: walk the parents if domain doesn't provide the service
    :param secure: only return DNSSEC-validated results
    :return: [
        [ prio1server1, prio1server2 ],
        [ prio2server1, prio2server2 ],
    ] (the servers will already be weighted according to the SRV rules)

def service(
    svc,
    proto='tcp',
    domain=None,
    walk=False,
    secure=None
):
    '''
    Find an SRV service in a domain or it's parents
    :param svc: service to find (ldap, 389, etc)
    :param proto: protocol the service talks (tcp, udp, etc)
    :param domain: domain to start search in
    :param walk: walk the parents if domain doesn't provide the service
    :param secure: only return DNSSEC-validated results
    :return: [
        [ prio1server1, prio1server2 ],
        [ prio2server1, prio2server2 ],
    ] (the servers will already be weighted according to the SRV rules)
    '''
    qres = query(srv_name(svc, proto, domain), 'SRV', walk=walk, secure=secure)
    if not qres:
        return False

    res = []
    for _, recs in qres.items():
        res.append(_weighted_order(recs))

    return res