docutils 0.19 deprecated OptionParser

[Lajos Katona]

docutils 0.19 deprecated OptionParser and this causes that DockerReadmeTestCase.test_mentioned_latest_version and DocstringsTestCase.test_all_plugins_have_docstrings started to fail:
testtools.testresult.real._StringException: Traceback (most recent call last):
  File "/home/lajoskatona/github/rally-openstack/tests/unit/doc/test_docker_readme.py", line 66, in test_mentioned_latest_version
    releases = self.get_releases()
  File "/home/lajoskatona/github/rally-openstack/tests/unit/doc/test_docker_readme.py", line 40, in get_releases
    settings = frontend.OptionParser(
  File "/home/lajoskatona/github/rally-openstack/.tox/py38/lib/python3.8/site-packages/docutils/frontend.py", line 662, in __init__
    warnings.warn('The frontend.OptionParser class will be replaced '
DeprecationWarning: The frontend.OptionParser class will be replaced by a subclass of argparse.ArgumentParser in Docutils 0.21 or later.

As I understand the new argparse.ArgumentParser based solution will be implemented in docutils, so a quick workaround till it is ready to limit docutils to <0.19

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/rally-openstack/+/849281

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/rally-openstack/+/849464

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/rally-openstack/+/849464
Committed: https://opendev.org/openstack/rally-openstack/commit/c1d9cf911bb66225f8332a1ca3cdddf00a7e0996
Submitter: "Zuul (22348)"
Branch: master

commit c1d9cf911bb66225f8332a1ca3cdddf00a7e0996
Author: Andrey Kurilin <email address hidden>
Date: Tue Jul 12 11:27:48 2022 +0300

    Suppress 2 warnings from Docutils

    The following 2 warnings do not require any modification of our code, so
    we can silently hide them and wait for new release of docutils:

    - The frontend.OptionParser class will be replaced by a subclass of
      argparse.ArgumentParser in Docutils 0.21 or later.
    - The frontend.Option class will be removed in Docutils 0.21 or later.

    Also, this commit temporary disables all dsvm job. They require a fix
    for list-resources ansible role, but it would be nice to do that in a
    separate change.

    Change-Id: I82e794c3d12222db9380701e6923b6e065b596ac
    Closes-Bug: 1981194

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Andrey Kurilin <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/rally-openstack/+/849281
Reason: Thanks for raising this issue.

The proper fix is here - https://review.opendev.org/c/openstack/rally-openstack/+/849464

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/rally-openstack 2.3.0 release.