Merge PR #39856 into pacific

* refs/pull/39856/head:
	qa/distro/ubuntu_20.04_podman: Avoid getting asked
	qa/suites/rados/cephadm: drop centos/rhel cephadm tests for the moment
	qa/sites/rados/cephadm/thrash: rename 3-tasks.yaml/ -> 3-tasks/
	qa/suites/rados/cephadm: adjust distros
	qa/suites/upgrade: use kubic; test all distros
	qa/suites/rados/cephadm/upgrade: use kubic on centos
	qa: new kubic distro files; use kubic podman for centos/rhel
	qa/suites/rados/cephadm: Add 20.04 podman:testing

Reviewed-by: Sebastian Wagner <swagner@suse.com>