[issue18174] Make regrtest with --huntrleaks check for fd leaks

[Charles-François Natali]

Charles-François Natali added the comment:

The patch looks good.
I just think it would be nice to expose _fdcount() in test.support.

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nosy: +neologix

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18174>
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