Comment 9 for bug 1809238

Reviewed: https://review.openstack.org/651759
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=21bbe03619a7036ccf61a8012355b8972d660b86
Submitter: Zuul
Branch: stable/rocky

commit 21bbe03619a7036ccf61a8012355b8972d660b86
Author: LIU Yulong <email address hidden>
Date: Mon Dec 17 10:35:33 2018 +0800

    Make test service_plugins override simple

    Just make things simple and give a chance to accept that
    ordered 'service_plugins' list or tuple for the base test
    class NeutronDbPluginV2TestCase.

    Change-Id: I7c352ede811703e3a96848378b92cbbf5e109228
    Related-Bug: #1809238
    (cherry picked from commit 76c28812013c558041612609efe30b88a5226267)