title: How to remove default example dags in airflow
body: <p>I am a new user of Airbnb's open source workflow/datapipeline software <a href="https://github.com/apache/incubator-airflow" rel="noreferrer">airflow</a>. There are dozens of default example dags after the web UI is started.  I tried many ways to remove these dags, but I've failed to do so. </p>
  
  <ul>
  <li><code>load_examples = False</code> is set in airflow.cfg.</li>
  <li>Folder lib/python2.7/site-packages/airflow/example_dags is removed.</li>
  </ul>
  
  <p>States of those example dags are changed to gray after I removed the dags folder, but the items still occupy the web UI screen. And a new dag folder is specified in airflow.cfg as <code>dags_folder = /mnt/dag/1</code>. I checked this dag folder, nothing is there. It's really weird to me why it is so difficult to remove these examples.</p>