rally db create fails with ModuleNotFoundError: No module named 'fixtures'

[yatin]

Fails as below:-

$ rally db create
Traceback (most recent call last):
  File "/tmp/venv/bin/rally", line 5, in <module>
    from rally.cli.main import main
  File "/tmp/venv/lib64/python3.10/site-packages/rally/cli/main.py", line 20, in <module>
    from rally.cli import cliutils
  File "/tmp/venv/lib64/python3.10/site-packages/rally/cli/cliutils.py", line 28, in <module>
    from rally import api
  File "/tmp/venv/lib64/python3.10/site-packages/rally/api.py", line 28, in <module>
    from rally.common import cfg
  File "/tmp/venv/lib64/python3.10/site-packages/rally/common/cfg.py", line 19, in <module>
    from oslo_config import fixture # noqa
  File "/tmp/venv/lib64/python3.10/site-packages/oslo_config/fixture.py", line 18, in <module>
    import fixtures
ModuleNotFoundError: No module named 'fixtures'

Reproduce with:-
$ python3 -m venv venv
$ source venv/bin/activate
$ pip install rally # or pip install git+https://github.com/openstack/rally
$ rally db create

Failing since testtools>2.6.0
$ pip show testtools
Name: testtools
Version: 2.7.1
Summary: Extensions to the Python standard library unit testing framework
Home-page:
Author:
Author-email: "Jonathan M. Lange" <email address hidden>
License:
Location: /tmp/venv/lib/python3.10/site-packages
Requires:
Required-by: python-subunit, testscenarios

$ pip install testtools==2.6.0
Collecting testtools==2.6.0
  Using cached testtools-2.6.0-py3-none-any.whl (182 kB)
Collecting fixtures>=2.0
  Using cached fixtures-4.1.0-py3-none-any.whl (64 kB)
Requirement already satisfied: pbr>=0.11 in ./venv/lib/python3.10/site-packages (from testtools==2.6.0) (5.11.1)
Installing collected packages: fixtures, testtools
  Attempting uninstall: testtools
    Found existing installation: testtools 2.7.1
    Uninstalling testtools-2.7.1:
      Successfully uninstalled testtools-2.7.1
Successfully installed fixtures-4.1.0 testtools-2.6.0

$ rally db create
Creating database: sqlite:////tmp/rally.sqlite
Database created successfully