File _servicedata of Package google-guest-agent

<servicedata>
<service name="tar_scm">
                <param name="url">https://github.com/GoogleCloudPlatform/guest-agent/</param>
              <param name="changesrevision">8ecd8b2fe86916d2ed4e0b297499bf3bfea4d86f</param></service></servicedata>