* Fix CI job that check rally installation with CentOS 9. Previously it
used CentOS 8 node :)
* Start using Ubuntu 22.04 LTS as much as possible
* Use python 3.10 by default for most tox envs
* Fix issues with new hacking&flake8
* Rewrite the way of preparation for tox
Change-Id: I77eba97596df4448065982956c3b6fb08c8e45db