title: Ansible tag include_role is not working for ansible version 2.3
body: <p>I have following playbook</p>
  <pre class="lang-yaml prettyprint-override"><code>- name: Restart Apache Server
    hosts: &quot;{{ host }}&quot;
    include_role: 
      name: root
      tasks_from: apache-restart.yml
    become: true
    become_user: root
  </code></pre>
  <p>When I am running this playbook it is throwing me the following error</p>
  <pre><code>ERROR! 'include_role' is not a valid attribute for a Play
  
  The error appears to have been in '/Users/Atul/Workplace/infra-automation/deployments/LAMP/site.yml': line 18, column 3, but may
  be elsewhere in the file depending on the exact syntax problem.
  
  The offending line appears to be:
  
  
  - name: Restart Apache Server
    ^ here
  </code></pre>
  <p>Following are the details of Ansible installed in my laptop.</p>
  <pre><code>ansible 2.3.1.0
    config file = /Users/Atul/Workplace/infra-automation/ansible.cfg
    configured module search path = Default w/o overrides
    python version = 2.7.13 (default, Apr  4 2017, 08:47:57) [GCC 4.2.1 Compatible Apple LLVM 8.1.0 (clang-802.0.38)]
  </code></pre>