Update go/no-go script for F39 Final attempt #1
    
    Also add a CoreOS / IoT checkin topic, because we constantly
    forget to do that, and move the RC item first in the list (it
    seems to make most sense there - if we don't have an RC, game
    over).
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>