File _service of Package helpers

<services>
        <service name="obs_scm">
                <param name="extract">*</param>
                <param name="filename">helpers</param>
                <param name="revision">master</param>
                <param name="scm">git</param>
                <param name="submodules">disable</param>
                <param name="url">https://github.com/olafhering/helpers</param>
                <param name='versionformat'>%cd.%h</param>
        </service>
        <service mode="buildtime" name="tar">
                <param name="obsinfo">helpers.obsinfo</param>
        </service>
        <service mode="buildtime" name="set_version">
                <param name="basename">helpers</param>
        </service>
</services>