Remove the ability to remove docker blobs via API
As a user, I want docker repos to have "mirror on sync"
As a user, I can verify blobs checksum during sync
As a user, I want to specify download policy for docker container images.
Do not log that a download fails with 401 (INFO) unless it fails again after token refresh
As a user I can opt out of mirorring source containers.
Improve error message for registry errors