[issue6276] Fix contextlib.nested DeprecationWarning for test_signal.

[Vikram U Shenoy]

Vikram U Shenoy <vikram.u.shenoy at gmail.com> added the comment:

Ping. This is a legit fix right ?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6276>
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