Comment 4 for bug 1973116

hemanth and I debugged the problem and found out why.

upper-constraints.txt [0] is missing setuptools for python_version=='3.9', so:

1, master branch on focal works, that's because master is using testr [1] so setuptools=62.1.0 works with testr.

2, but for yoga on focal, setuptools=62.1.0 doesn't work with non-testr so the problem happened.

[0] https://opendev.org/openstack/requirements/raw/branch/stable/yoga/upper-constraints.txt
[1] https://opendev.org/openstack/aodh/commit/63c3466f291996c3d5f99e307f8784abeeb1ef78