Comment 8 for bug 1943850

The issue is fixed in https://review.opendev.org/#/q/I8aea2b597b9dd9bbdc5a1527fae03e86364aab4c

TLDR: The octavia-tempest-plugin records all the role assignments for debugging purposes, but this does not have an effect on the tests themselves. The user role logging can now be skipped by setting `log_user_roles=False` in the tempest load-balancer configs.