[issue18904] Unnecessary test in file descriptor inheritance test

[Roundup Robot]

Roundup Robot added the comment:

New changeset b7f6f6f59e91 by Victor Stinner in branch 'default':
Issue #18904: test_socket: add inheritance tests using fcntl and FD_CLOEXEC
http://hg.python.org/cpython/rev/b7f6f6f59e91

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<http://bugs.python.org/issue18904>
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