Comment 3 for bug 1783949

Reviewed: https://review.openstack.org/579170
Committed: https://git.openstack.org/cgit/openstack/tripleo-heat-templates/commit/?id=6364f2286c770b9392d432408b8aef32c8a401ae
Submitter: Zuul
Branch: master

commit 6364f2286c770b9392d432408b8aef32c8a401ae
Author: Jiri Stransky <email address hidden>
Date: Fri Jun 29 16:14:36 2018 +0200

    Update and upgrade tasks for services deployed via external deploy tasks

    Composable service templates can now define external_update_tasks and
    external_upgrade_tasks. They are meant for update/upgrade logic of
    services deployed via external_deploy_tasks. The external update
    playbook first executes external_update_tasks and then
    external_deploy_tasks, the procedure for upgrades works
    analogously. All happens within a single playbook, so variables or
    fact overrides exported from the update/upgrade tasks will be
    available to the deploy tasks during the update/upgrade procedure.

    Partial-Bug: #1783949
    Change-Id: Ib2474e8f69711cd6610a78884d5032ffd19ad249