[issue17830] Fix test_keyword on Windows, clean up addCleanup

[R. David Murray]

R. David Murray added the comment:

The filecmp test failure is not because of using filecmp.  We want a binary comparison: the line endings of the generated file should match the line endings of the input file.  So either the _copy_file_without_generated_keywords code is buggy, or this is a real bug in keyword.py.  Probably the former.

As for addCleanup, I prefer the lambda version.  But I'm fine with using the non-lambda version if that is more common in the test suite.

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<http://bugs.python.org/issue17830>
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