title: Ansible: overwrite inventory's ansible_host from command line
body: <p>I have a simple inventory in <code>hosts</code>:</p>
  
  <pre><code>dockermachine ansible_host=10.10.10.10
  </code></pre>
  
  <p>I need to be able to provide any other IP I wish from the command line, overwriting the default, something like:
  <code>ansible-playbook -i hosts@dockermachine.ansible_host=11.11.11.11 site.yml</code></p>
  
  <p>How can I do this?</p>