Add a script to relate pylint errors to lines changed.
Add a script to relate pylint errors to lines changed.

Note that this does not:
1) Identify all new errors that pylint has detected that your code introduced.
2) Omit errors that are in lines that changed but that your code did not
introduce.

Note that it expects that you have already run the pylint testing script and
that pylint has logged the output.

You will need to have diff-cover (https://github.com/edx/diff-cover)
in your path.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

dwlehman/blivet,vojtechtrefny/blivet,rhinstaller/blivet,dwlehman/blivet,vojtechtrefny/blivet,AdamWill/blivet,rvykydal/blivet,jkonecny12/blivet,vpodzime/blivet,vpodzime/blivet,rhinstaller/blivet,jkonecny12/blivet,rvykydal/blivet,AdamWill/blivet