title: Ansible 2.4 hostfile warning
body: <p>In Ansible 2.4, I'm getting this deprecation warning:</p>
  
  <pre><code>[DEPRECATION WARNING]: [defaults]hostfile option, The key is misleading as it can also be a list of hosts, a directory or a list of
  paths . This feature will be removed in version 2.8. Deprecation warnings can be disabled by setting deprecation_warnings=False in
  ansible.cfg.
  </code></pre>
  
  <p>For the life of me, I cannot figure out what this means.  Anybody know?</p>