Comment 5 for bug 1690843

Reviewed: https://review.opendev.org/657947
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=47580bde5a626b2b8c8de7badd122fcbc8efb8c0
Submitter: Zuul
Branch: stable/rocky

commit 47580bde5a626b2b8c8de7badd122fcbc8efb8c0
Author: caoyuan <cao.yuan@99cloud.net>
Date: Tue Mar 26 19:12:41 2019 +0800

    update the event_connection to connection for panko

    more infomation, refer to the panko docs[1] or code[2]

    [1]: https://docs.openstack.org/panko/rocky/install/manual.html
    [2]: https://github.com/openstack/panko/blob/9c4677f1784ed3353c31067e6e1bf74a0c86c037/panko/storage/__init__.py#L39

    Change-Id: Ic7bdf555eb262005ca24f675cd8cee09d9bc3092
    Closes-Bug: #1690843
    (cherry picked from commit 47a2c5a85e9311a6b07f468b8dc7b652cc9416ba)