server DVD: include Server environment, remove others
    
    the Server environment itself is not actually included in F24
    and Rawhide Server DVDs ATM, only 'Infrastructure Server' and
    'Web Server' show up in the environment list. This lists the
    Server environment and removes the other two, which we don't
    want to make available as environments for Fedora Server.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>