Update to latest HEAD.
    
    - Don't use the provide for distroverpkg if it's the name of the pkg. BZ 1002977.
    - Use the provides as-is when we do use it. BZ 1002977.
    - Fix the man page formatting for ! explanation in repolist, so it can be read.
    - Add deltarpm_metadata_percentage config. so people can configure MD download.