Comment 6 for bug 1783303

Reviewed: https://review.openstack.org/593595
Committed: https://git.openstack.org/cgit/openstack/tripleo-upgrade/commit/?id=7357d5714fa9b9a9aafb118347c91fdb11c2eef7
Submitter: Zuul
Branch: stable/queens

commit 7357d5714fa9b9a9aafb118347c91fdb11c2eef7
Author: Jose Luis Franco Arza <email address hidden>
Date: Wed Jul 25 08:48:46 2018 +0200

    Change include for include_tasks when including loop controled scripts.

    We obtain a 'controllers' is undefined ansible error when
    the tripleo-upgrade is run without any role related tag
    (e.g. overcloud_upgrade, overcloud_update, etc...). The
    issue seems to appear at the time of including the
    controller_post_script.yml tasks, which content is defined
    depending on the result of a shell command. As the command
    is not executed during the role importing, the include fails.

    The new include_tasks keyword seems to handle this issue
    without displaying any error. Also the include keyword was
    deprecated in Ansible 2.4, so it's time to start moving into
    include_tasks/import_tasks.

    Change-Id: I9d10e1d9a95e11fd59bf593bb052abf9eb17cf78
    Closes-Bug: #1783303
    (cherry picked from commit 629309217b13118ca83016cd9553c8a426c8a31d)