Remove XMLRPC registration for nonexistent demo attack on ImageRepo
Remove XMLRPC registration for nonexistent demo attack on ImageRepo

We aren't using an arbitrary package attack using an already-revoked
key on the Image Repo; that attack against the Director repo
suffices.

uptane/uptane,awwad/uptane,awwad/uptane,shikhar394/uptane,uptane/uptane,shikhar394/uptane