Descheduler SoftTopologyAndDuplicates uses Stategy RemovePodsViolatingTopologySpreadConstraint which has invalid mapping

4.12

Always

1. Create a three node cluster
2. Create a SoftTopologyAndDuplicates Descheduler Operator Policy (KubeDescheduler)
3. Assign three labels to the nodes (w0: zone=a, w1: zone=b, w3: zone=b)
4. create 4 replica sets (you may need to cordon w3
5. Reassign the label for w1 to zone=a
6. Uncordon w3
7. You see no log data on the descheduler showing the pod was evicted.

No rebalancing occurs

The zones should rebalance within the maxskew

This worked in 4.11 and not 4.12 as of: 

https://github.com/openshift/descheduler/commit/674bf4655d71f4674ee5c111f29903905f985e1e#diff-548663336f315a426f99e4cee346e72f48e31820fd5dba6fac5e4acd289a0506R194

https://github.com/openshift/descheduler/blame/master/pkg/descheduler/strategy_migration.go#L215 <-- this line is the problem

I have a working PR with the Fix