[issue2777] subprocess unit tests for kill, term and send_signal flaky

[Florent Xicluna]

Florent Xicluna <florent.xicluna at gmail.com> added the comment:

I experienced this hang with Linux AMD64.

It occurs in test_send_signal.
It is because signal.SIGINT is not always handled (see #3137).

As a workaround, there's 2 choices: add a delay between Popen and send_signal, or retry SIGINT 2 or 3 times.

Windows should not be affected, because it uses signal SIGTERM in the test.

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<http://bugs.python.org/issue2777>
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