oc adm prune deployments to prune replica set

1. Proposed title of this feature request
"oc adm prune deployment" command prune replication controller . with 4.0 deployments use replicaset as noted in this document https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller/
The command only remove replication controller . the gaol to prune all replica set when run "oc admin prune deployment " command

2. What is the nature and description of the request?
As an OCP admin i want to re claim unused space occupied by unused deployments so that i can better manage the compute resources in the node

3. Why does the customer need this? (List the business requirements here)
Customer wants to be able to do clean up for deployments/replicasets, as nowadays with 4.x, deployments/replicasets are the default way of deployment.

4. List any affected packages or components.