[3.6] bpo-29692: contextlib.contextmanager may incorrectly unchain RuntimeError ...

[3.6] bpo-29692: contextlib.contextmanager may incorrectly unchain RuntimeError (GH-949) (#1105)

contextlib._GeneratorContextManager.__exit__ includes a special case to deal with
PEP 479 RuntimeErrors created when `StopIteration` is thrown into the context
manager body.

Previously this check was too permissive, and undid one level of chaining on *all*
RuntimeError instances, not just those that wrapped a StopIteration instance.
(cherry picked from commit 00c75e9a45ff0366c185e9e8a2e23af5a35481b0)