Cherry pick #413 to release-3.0#414

k8s-ci-robot merged 1 commit intokubernetes-csi:release-3.0kubernetes-csi/external-snapshotter:release-3.0from

RaunakShah:cherrypickpvcfinalizerRaunakShah/external-snapshotter:cherrypickpvcfinalizerCopy head branch name to clipboard