- Move ks tools from optparse to argparse (#1083913). (clumens)
    - Use descriptive pylint messages instead of numbers. (clumens)
    - Fix up some printing problems in some of the tools. (clumens)
    - Add support for the --listversions option to ksverdiff too. (clumens)
    - Run pylint on tools/, and fix up all the errors. (clumens)
    - disable-msg -> disable for pylint. (clumens)