Comment 16 for bug 1999183

Reviewed: https://review.opendev.org/c/openstack/devstack/+/867065
Committed: https://opendev.org/openstack/devstack/commit/9a1be7794bd3b1b06a89183a800f42f77cd1b1b9
Submitter: "Zuul (22348)"
Branch: master

commit 9a1be7794bd3b1b06a89183a800f42f77cd1b1b9
Author: Ghanshyam Mann <email address hidden>
Date: Thu Dec 8 20:24:46 2022 -0600

    Pin tox<4.0.0 for <=stable/zed branch testing

    Tox 4.0.0 has some incompatible changes, epecially more
    strict on allowlist_externals. Tempest recently changed
    allowlist_externals not to be *[1] causing the failure
    on jobs where lib/tempest failing to run the tempest
    as command in virtual env.

    ----------
    venv: commands[0]> tempest verify-config -uro /tmp/tmp.qH5KgJHTF4
    venv: failed with tempest is not allowed, use allowlist_externals to allow it
    ------

    We do not need to test/fix the <=stable/zed branches with tox 4.0.0
    and pinning them with the compatible tox version of the time stable
    brnaches were releaased is better way.

    This commit proposes:
    1. Pinning the tox<4.0.0 for <=stable/ze branches testing
    2. Workaround to unblock the master gate by pinning it <4.0.0 but
    we should make our testing compatible with tox 4.0.0 soon.

    Depends-On: https://review.opendev.org/c/openstack/devstack/+/867066

    Related-Bug: #1999183

    [1] https://review.opendev.org/c/openstack/tempest/+/865314 devstack based job started failing to run tempest command on venv.

    Change-Id: I9a138af94dedc0d8ce5a0d519d75779415d3c30b