Comment 3 for bug 1903689

I think the root cause is that neutron-lib is constrained in ussuri (neutron-lib==2.3.0), but neutron is not (neutron==17.0.0) [1]. The new constant was introduced with patch I0a69f1bddaa7030c7287216e62ec1ac6dd381475 in victoria.

If I'm not mistaken there should be some automation that sets upper-constraint for some packages, e.g. neutron, but it missed to cap it in ussuri (and victoria?). An example for that patch is this one: I6c35d75dafb144a3723c3735373a76e3a674c7ff

[1] https://zuul.opendev.org/t/openstack/build/8628803415a34b6e84fa3635eda6946b/log/job-output.txt#638