Add the fedora-repos-archive subpackage.
    
    This should aid our efforts to make package layering more reliable in
    OSTree based Editions. See:
    
    - https://github.com/coreos/fedora-coreos-tracker/issues/400
    - https://github.com/coreos/fedora-coreos-tracker/issues/401
    - https://pagure.io/releng/issue/9717
    - https://lists.fedoraproject.org/archives/list/iot@lists.fedoraproject.org/thread/QZFVKH2SMHJNIZS2M4U25CHJOZXIKLWG/
    
    Signed-off-by: Dusty Mabe <dusty@dustymabe.com>