utils: Add Python-based commit style checker script

checkstyle.py is a reimplementation of checkstyle.sh in Python, that
should be easier to extend with additional features.

Three additional features and enhancements are already implemented:

- While retaining the default behaviour of operating on the HEAD commit,
  a list of commits can also be specified on the command line.

- Correct line numbers are printed in the diff output.

- The index and working tree are not touched, they can be dirty.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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