Make docker registry work with location redirects when external storage is used
What does this MR do?
Honor Location: header when working with local registry.
Location makes it possible to download manifests from external storage.
What are the relevant issue numbers?
Fixed https://gitlab.com/gitlab-org/gitlab-ce/issues/18477
Remark
Adding FollowRedirects makes that we leak Authorization: in followed requests.
That is why it is implemented manually and we are explicitly removing Authorization header.