Move buildinstall results to final directories if using pungi-buildinstall Koji plugin.
    
    If Koji pungi-buildinstall is used, then the buildinstall results are
    stored in the `output_dir` dir, but in "results" and "logs" subdirectories.
    We need to move them to final_output_dir.
    
    Signed-off-by: Jan Kaluza <jkaluza@redhat.com>