Comment 5 for bug 1806089

oh, clenaup.py uses json from jsonutils from oslo_serialization:
https://github.com/openstack/tempest/blob/d47a79c2b54848d101ade3b753e547b49158e5ce/tempest/cmd/cleanup.py#L81

here's the commit:
https://github.com/openstack/tempest/commit/2190551738eb0672b52d0ed324b2ca1476b6f819

Now need to check it the description in the commit message is still true.