[3.6] bpo-31320: No traceback to sys.stderr in test_ssl (GH-3360) by miss-islington · Pull Request #3369 · python/cpython

@tiran @miss-islington

In case PROTOCOL_TLS_SERVER is used for both client context and server
context, the test thread dies with OSError. Catch OSError to avoid
traceback on sys.stderr

Signed-off-by: Christian Heimes <christian@python.org>
(cherry picked from commit 305e56c)

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