Tags and digests are kept in the same storage. We want to make sure that they are completely separated - tags are something users set and digests can only be set by pull-by-digest code path. Reverts #14664 Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com> Upstream-commit: d08ca5c2b65d442f37424957e53d81f96356d12c Component: engine