Use latest Ansible version with Python 3.8
Use latest Ansible version with Python 3.8

To allow a smooth migration to new ansible version
let use it only on very new jobs first, before
migrating existing ones to new ansible versions.

This changes expectes that only very few jobs
at this moment would be using infrared with
Python 3.8, limitating the impact of this change.

Jira-Id: RHOSINFRA-3462
Change-Id: Ia7e3c55b4797b4380aecc02081650093ceecd706

redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared