title: Why is dev_appserver.py reporting "no such file or directory" after today's gcloud components update
body: <p>I've been successfully running the local development server daily and have made no changes except that I called "gcloud components update" just before it stopped working.  Now I get: </p>
  
  <pre><code>..snip...    &lt;&lt;PATH TO MY SDK&gt;&gt;/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/application_configuration.py", line 518, in _parse_configuration
          with open(configuration_path) as f:
      IOError: [Errno 2] No such file or directory: 'app.yaml'
  </code></pre>
  
  <p>Of course app.yaml hasn't moved. </p>
  
  <p>Any thoughts? </p>