Description of problem: overcloud installation downloads hard coded version of Fedora image [1] that is later used for tester [2], only when specific regex for minimal test is present. This image should be downloaded only if intended to be used, and the distro and version should be configurable. [1] playbooks/installer/rdo-manager/overcloud/run.yml L10-L14 [2] playbooks/post-deploy/rdo-manager/overcloud-test.yml L27-L44