bpo-18174: Fix file descriptor leaks in tests (GH-7408)
* test_tempfile.test_no_leak_fd() mocks os.close() but it doesn't call the original os.close() method and so leaks an open file descriptor. Fix the test by calling the original os.close() function. * test_posix.test_fdopen_directory(): close the directory file descriptor when the test completes.
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