title: Change extension to config when using karaf feature config
body: <p>I use karaf's feature config support in order to generate config files under /etc folder. The configuration in the feature file looks like:</p>
  
  <pre><code>&lt;config name="com.foo.bar"&gt;
      myProperty = myValue
  &lt;/config&gt;
  </code></pre>
  
  <p>This works fine and karaf generates com.foo.bar.cfg under /etc. Now I wonder if it's possible to somehow tell karaf to use .config extension instead of .cfg. Factory configurations does not work well (they get duplicated) if .cfg extension is used.</p>