Cinder doesn't work with clouds.yaml. We need to convert the clouds.yaml entry from CI into environment variables cinder can work with.

The openstack job template already does this (badly) at https://github.com/openshift/release/blob/06d03a7/ci-operator/templates/openshift/installer/cluster-launch-installer-openstack-e2e.yaml#L189-L192

A better implementation can be found at https://gist.github.com/mandre/fc9e21aa27e758f3542510ca5ec495be

We need the same thing for the step-registry.