Enable debugsource and debuginfo subpackages by default
    
    As agreed on #fedora-devel with Dennis Gilmore that rel-eng tooling
    requires some small changes and even if we miss something, it can
    be fixed later.
    
    (08:43:55 PM) dgilmore: we have the immediate tools we know need updating and the changes should be simple
    (08:44:13 PM) dgilmore: so I am okay if rpm changed its behaviour right now
    
    Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>