title: Ansible python version won't change
body: <p>I'm executing:</p>
  
  <p><code>ansible-playbook --version</code></p>
  
  <p>And I get the following output:</p>
  
  <pre><code>ansible-playbook 2.5.14
    config file = /etc/ansible/ansible.cfg
    configured module search path = [u'~/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
    ansible python module location = /usr/lib/python2.7/dist-packages/ansible
    executable location = /usr/bin/ansible-playbook
    python version = 2.7.12 (default, Nov 12 2018, 14:36:49) [GCC 5.4.0 20160609]
  </code></pre>
  
  <p>But when I execute:</p>
  
  <p><code>ansible-playbook --version -e 'ansible_python_interpreter=/usr/bin/python3'</code></p>
  
  <p>I'm having exactly the same output. I was expecting having something like:</p>
  
  <pre><code>python version = 3.5.2
  </code></pre>
  
  <p>What am I misunderstanding?</p>