Comment 5 for bug 1844174

Reviewed: https://review.opendev.org/682475
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=c074a7bd314889024c648e7f6f038242209927d9
Submitter: Zuul
Branch: master

commit c074a7bd314889024c648e7f6f038242209927d9
Author: Matt Riedemann <email address hidden>
Date: Mon Sep 16 16:33:58 2019 -0400

    Remove redundancies from AggregateRequestFiltersTest.setUp

    Change I9ab9d7d65378be564b3731b5227ede8cece71bef made
    AggregateRequestFiltersTest extend ProviderUsageBaseTestCase
    but left a lot of redundant setUp for fixtures and services
    in it which might be contributing to test_fail_set_az failing
    intermittently. My theory is that we're starting multiple API
    and scheduler workers and when setting an AZ on an aggregate
    the API will RPC cast to all schedulers to store that metadata
    information in the scheduler process. Since we have more than
    one scheduler process, and I'm not sure how stable the RPC cast
    fanout capability is in the fake messaging driver, we could be
    hitting a scheduler worker during the test that does not have
    the AZ metadata and the AvailabilityZoneFilter filters out the
    expected host.

    This simply removes the redundant setUp. Even if this isn't the
    root of the problem it at least rules it out.

    Change-Id: I45107ff686456d5db91c615830fa443b3902ddfb
    Partial-Bug: #1844174