libvirt reproducer script fails on yum var $contentdir

TASK [nodepool-setup : Install repos (will be removed by toci_gatetest)] ********************************************************************************************************************************************
changed: [subnode-0] => (item=centos-release-openstack-ocata)
failed: [subnode-0] (item=epel-release) => {"changed": false, "failed": true, "item": "epel-release", "msg": "Failure talking to yum: failure: repodata/repomd.xml from centos-qemu-ev: [Errno 256] No more mirrors to try.\nhttp://mirror.centos.org/$contentdir/7/virt/x86_64/kvm-common/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found"}
changed: [subnode-1] => (item=centos-release-openstack-ocata)
failed: [subnode-1] (item=epel-release) => {"changed": false, "failed": true, "item": "epel-release", "msg": "Failure talking to yum: failure: repodata/repomd.xml from centos-qemu-ev: [Errno 256] No more mirrors to try.\nhttp://mirror.centos.org/$contentdir/7/virt/x86_64/kvm-common/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found"}
 to retry, use: --limit @/var/tmp/docker/tripleo-quickstart-extras/playbooks/nodepool-setup.retry

Luckily Mr Steve Baker has a patch :)
https://review.openstack.org/#/c/568701/

This speaks to the need to get this script into CI, easier said then done.