File _link of Package python-novaclient

<link project="openSUSE:Factory" package="python-novaclient" baserev="9657b0abc714d97ebfa7667696ebf4ae">
  <patches>
    <delete name="_service"/>
    <delete name="python-novaclient-18.7.0.tar.gz"/>
    <apply name="project.diff"/>
  </patches>
</link>