This change applies rollout wait introduced in patch [1] to any other
test that can benefit from such extra stability.
[1] 945106: Wait for config rollout to complete in test_api_server
https://review.opendev.org/c/x/whitebox-neutron-tempest-plugin/+/945106
Change-Id: I2aaa0170f702c278be1d193dca30450c46f1303f