Comment 7 for bug 1943968

Reviewed: https://review.opendev.org/c/openstack/tripleo-quickstart/+/810410
Committed: https://opendev.org/openstack/tripleo-quickstart/commit/bc637b1bbbe116a69037302bdb50981387a3a5e8
Submitter: "Zuul (22348)"
Branch: master

commit bc637b1bbbe116a69037302bdb50981387a3a5e8
Author: Marios Andreou <email address hidden>
Date: Wed Sep 22 13:51:03 2021 +0300

    Explicitly set python3 for ansible with get-hash to fix c7 jobs

    As described in related bug (see comments 4,6) the ansible python
    interpreter is set as 'auto' so for the centos7 jobs the python2
    interpreter is used which caused the bug. Explicitly setting to
    python3 addresses the issue and we can wireup get-hash without
    needing a special case for centos7.

    Related-Bug: 1943968

    Change-Id: I299bdb7c74fa5eb05b1bffc856abaeaca2497dca