Comment 13 for bug 1977888

Reviewed: https://review.opendev.org/c/openstack/tripleo-ci/+/845081
Committed: https://opendev.org/openstack/tripleo-ci/commit/6d7eaa96f73f348ecdd8b63c8a31ad64e2411119
Submitter: "Zuul (22348)"
Branch: master

commit 6d7eaa96f73f348ecdd8b63c8a31ad64e2411119
Author: Chandan Kumar (raukadah) <email address hidden>
Date: Wed Jun 8 09:36:15 2022 +0530

    Install Python38 on CentOS-8

    DIB is a branchless project and it gets pulled from master.
    https://review.opendev.org/c/openstack/diskimage-builder/+/836229
    drops the py36 support and is breaking cs8 image build.

    Installing Python38[1] will fix the issue.

    It also drops python3-tripleoclient and python3-devel installation
    from main.yml. It is already taken care by release file.

    py38 does not works well with Ansible on CentOS-8[2].

    So we also set ensure_pip_virtualenv_command var to pip ansible module
    to explicitly use python_version based on need.

    [1]. https://pkgs.org/download/python38
    [2]. https://github.com/ansible/ansible/issues/67083

    Closes-Bug: #1977888

    Depends-On: https://review.opendev.org/c/openstack/diskimage-builder/+/845189

    Signed-off-by: Chandan Kumar (raukadah) <email address hidden>
    Change-Id: Ib87eb7bbe6b523e3bf78c7f870cff96d5b5dd7e1