Delete pods and pvcs when deleting cluster.

Created by: garloff

We want to avoid leaving OpenStack resources behind. Thus we want to clean up persistent volume claims. To be able to do so, these must not be in-use, which we achieve by also deleting all pods.

To be done: We probably would need to treat loadbalancers like persistent volume claims. (Will do after we have good test cases for these.)

Signed-off-by: Kurt Garloff kurt@garloff.de