cluster-clean: avoid --timeout reimplementation
cluster-clean: avoid --timeout reimplementation

The dropped code requested a delete, waited forever and then polled the server every 3
seconds until the deleted namespace is gone. `kubectl delete
--timeout=X` seems to be doing it better [1]

[1] https://github.com/kubernetes/kubectl/blob/0f88fc6b598b7e883a391a477215afb080ec7733/pkg/cmd/wait/wait.go#L268

Signed-off-by: Dan Kenigsberg <184831158ae7531bcabc22617ed51e8717c81e93@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt