title: How to set host_key_checking=false in ansible inventory file?
body: <p>I would like to use <code>ansible-playbook</code> command instead of '<code>vagrant provision</code>'. However setting <code>host_key_checking=false</code> in the <code>hosts</code> file does not seem to work. </p>
  
  <pre><code># hosts file
  vagrant ansible_ssh_private_key_file=~/.vagrant.d/insecure_private_key 
  ansible_ssh_user=vagrant ansible_ssh_port=2222 ansible_ssh_host=127.0.0.1 
  host_key_checking=false
  </code></pre>
  
  <p>Is there a configuration variable outside of <code>Vagrantfile</code> that can override this value?</p>