config: Allow setting default compose type
    
    The config can change the default compose type. This can still be
    overwritten by a CLI argument. A `--production` option is now added to
    CLI (because that was the default before).
    
    Fixes: https://pagure.io/pungi/issue/694
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>