File _service of Package message_generation

<services>
  <service name="obs_scm">
    <param name="scm">git</param>
    <param name="url">https://github.com/ros-gbp/message_generation-release.git</param>
    <param name="revision">release/melodic/message_generation/0.4.1-1</param>
    <param name="versionformat">release</param>
    <param name="filename">message_generation</param>
  </service>
  <service name="tar" mode="buildtime"/>
  <service name="recompress" mode="buildtime">
    <param name="compression">bz2</param>
    <param name="file">*.tar</param>
  </service>
</services>