File _service of Package cobbler-docker-testing

<services>
    <service name="download_url">
        <param name="filename">Dockerfile</param>
        <param name="url">https://raw.githubusercontent.com/openSUSE/cobbler/suma/head/docker/develop/develop.dockerfile</param>
    </service>
    <service mode="buildtime" name="kiwi_metainfo_helper"/>
    <service mode="buildtime" name="docker_label_helper"/>
</services>