Comment 6 for bug 1836531

Reviewed: https://review.opendev.org/670796
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=d1035703b79545fb018e6bdc5b4c0c392c3dcc7a
Submitter: Zuul
Branch: master

commit d1035703b79545fb018e6bdc5b4c0c392c3dcc7a
Author: Jose Luis Franco Arza <email address hidden>
Date: Mon Jul 15 11:01:39 2019 +0200

    Force removal of docker container in tripleo-docker-rm.

    The tripleo-docker-rm role has been replaced by tripleo-container-rm [0].
    This role will identify the docker engine via the container_cli variable
    and perform a deletion of that container. However, these tasks inside the
    post_upgrade_tasks section were thought to remove the old docker containers
    after upgrading from rocky to stein, in which podman starts to be the
    container engine by default.

    For that reason, we need to ensure that the container engine in which the
    containers are removed is docker, as otherwise we will be removing the
    podman container and the deployment steps will fail.

    Closes-Bug: #1836531
    [0] - https://github.com/openstack/tripleo-ansible/commit/2135446a351eb6f6d57d86eca548d583d4c8bfb1

    Depends-On: https://review.opendev.org/#/c/671698/
    Change-Id: Ib139a1d77f71fc32a49c9878d1b4a6d07564e9dc