title: Gerrit OWNERS Plugin - adding groups to OWNERS file
body: <p>I use the <a href="https://gerrit-review.googlesource.com/Documentation/config-plugins.html#owners" rel="nofollow">owners plugin</a> to add a list of developers as reviewers to a change automatically, so one of them have to approve it for the change to be committed. </p>
  
  <p>Now, instead of changing the <code>OWNERS</code> file every time I need to add / remove a person to the list can I add a gerrit group to the <code>OWNERS</code> YAML file? I tried adding a group but it gets ignored. </p>
  
  <p>This is the content of my <code>OWNERS</code> file.</p>
  
  <pre><code>inherited: true
  owners:
  - owners_Build_tools
  </code></pre>
  
  <p>It would be helpful to know if it is supported or if there is something wrong with my YAML file. </p>