container sync: handle differences for Kiwi-built images
    
    Kiwi-built images use a slightly different "package name" in
    Koji, so we need to tweak the Koji command to find them. Also,
    Kiwi-built images are OCI archives, not Docker archives, so we
    need to tweak the `skopeo copy` command for that.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>