[issue39717] Fix exception causes in tarfile module

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

If this were new code, there would be a better case for the direct-cause style even though it is more cluttered and a bit slower.

I'm only questioning whether it make sense to change it in already deployed code, possibly risking breakage.  AFAICT, nothing is currently broken and the minor change in traceback wording would not confer a real benefit.

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<https://bugs.python.org/issue39717>
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