[issue10966] eliminate use of ImportError implicitly representing SkipTest

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

The attached patch has both the code to make test skipping more obvious as well as eliminating the concept of expected skips.

If someone can double-check that what I am doing here is sane and desirable I would appreciate it.

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assignee: brett.cannon -> 
stage: needs patch -> patch review
Added file: http://bugs.python.org/file21364/optional_tests.diff

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