push the 4.0 docs to a 4.0 branch (dennis)
    
    - [live-images] Rename log file (lsedlar)
    - [buildinstall] Use -dvd- in volume ids instead of -boot- (lsedlar)
    - [buildinstall] Hardlink boot isos (lsedlar)
    - [doc] Write documentation for kickstart Git URLs (lsedlar)
    - [util] Resolve branches in git urls (lsedlar)
    - [live-images] Fix crash when repo_from is not a list (lsedlar)
    - [buildinstall] Don't copy files for empty variants (lsedlar)
    
    Signed-off-by: Dennis Gilmore <dennis@ausil.us>