Apply cloud, docker and twoweek changes from 27 branch to master
    
    These aren't really used on the master branch, but we may as
    well make sure they're up to date, if only so *next* time we
    branch we don't regress. These are the changes I made to add the
    shortname to fedmsgs, fix exit on failed compose, and clean up
    a few other things.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>