Description of problem: As a CNV on OCP user I would like to be able to take advantage of backend devices that provide smart-cloning. Version-Release number of selected component (if applicable): Propose carry of VolumePVCDataSource feature-gate in OCP 4.2, this feature is currently Alpha in Kubernetes 1.15. This is however a low risk implementation and simply ignores or processes the DataSource field in a new PVC request. This feature is marked fro beta in 1.16 with no API changes since its introduction in 1.15 and is very low risk. PR proposing carry is here: https://github.com/openshift/origin/pull/23241#issuecomment-504471766