[issue16715] Get rid of IOError. Use OSError instead

[Terry J. Reedy]

Terry J. Reedy added the comment:

I don't think so. The idle test, test_idle, passed. The patch did not even affect any of the three idle files that it currently tests. Just because a commit triggers a test does not mean that it is the cause of any failure that happens. The log says the failure was in test_subprocess.
'''
FAIL: test_wait_timeout (test.test_subprocess.ProcessTestCaseNoPoll)
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Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.3.koobs-freebsd/build/Lib/test/test_subprocess.py", line 953, in test_wait_timeout
    p.wait(timeout=0.0001)
AssertionError: TimeoutExpired not raised
'''
As I interpret the traceback, this did not fail is the re-run.

I did not set 3.3, nor reopen, because this patch is primarily part of a new issue, #18151. I cross-referenced this one so that if anyone else thought of backporting some of the mega patch, this backport would be recorded here.

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<http://bugs.python.org/issue16715>
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