ardana-ci: remove references to DC8S repo and switch to provo mirror
ardana-ci: remove references to DC8S repo and switch to provo mirror

We recently switched the provo-clouddata mirror to sync more
often, so hopefully it is good enough.

gosipyan/automation,SUSE-Cloud/automation,aspiers/automation,gosipyan/automation,gosipyan/automation,SUSE-Cloud/automation,aspiers/automation,gosipyan/automation,aspiers/automation,aspiers/automation,SUSE-Cloud/automation,SUSE-Cloud/automation