Comment 5 for bug 1907125

Reviewed: https://review.opendev.org/c/starlingx/config/+/787238
Committed: https://opendev.org/starlingx/config/commit/87d6eec5289e53097c6a0455900a0f93508f2d8d
Submitter: "Zuul (22348)"
Branch: r/stx.4.0

commit 87d6eec5289e53097c6a0455900a0f93508f2d8d
Author: albailey <email address hidden>
Date: Tue Dec 8 12:17:40 2020 -0600

    Fix tox failures from new version of virtualenv and pip

    New pip was released on Dec 3, 2020 which breaks downloads
    from pypi for some URLs (python 3).

    New virtualenv was released Dec 7 which includes that new pip.

    In order for sysinv in python3 on ubuntu-bionic to pass its
    tox and zuul jobs, the legacy resolver must be used.

    The requirements may need to be updated in future revisions.

    Closes-Bug: 1907125
    Change-Id: Idecaee7d83f4cbf02454e172aa254b7d8d449141
    Signed-off-by: albailey <email address hidden>
    (cherry picked from commit 473e55b494b556bae9a41904ab9b85aa78d68e7f)