So it's easier to make adjustments without having to copy/paste code between branches.
oc adm release extract: provide option for extracting included manifests
oc#1237 (Unify extraction cases)
oc#1264 (Don't print image metadata verification messages when extracting to stdout)
openshift/oc#1404: OTA-994: pkg/cli/admin/release/extract: Centralize manifest extraction