mortar to retry in certain cases

[matti]

1. fire with mortar
2. delete namespace
3. fire with mortar again `` POST /api/v1/namespaces/hello-world/limitranges => HTTP 403 Forbidden: limitranges "hello" is forbidden: unable to create new content in namespace hello-world because it is being terminated (K8s::Error::Forbidden)

4. fire again until succeeds

this is a case where retry (with timeout) would be great