Fix l-c testing for Ubuntu Focal (py38)
Fix l-c testing for Ubuntu Focal (py38)

Change-Id: Icb28121e7a2f44af27dfa2767a4475ede4c6a583
Story: 2007865
Task: 40199
Closes-Bug: #1886298

stackforge/tacker,openstack/tacker,stackforge/tacker,openstack/tacker,openstack/tacker