Do not consider Pods marked for deletion when calculating tower_pod to
address replicas scale down case - where normally Pods spawned recently
are being taken for removal. As well as the case when operator kicked
off but some old replicas are still terminating.
Respect `creationTimestamp` so to make sure that the newest Pod is taken
after Deployment application, in which case multiple RS Pods (from old
RS and new RS) could be running simultaneously while the rollout is
happening.
Stanislav Zaprudskiy
b3a74362af