Bogus test failure in test_open_unix_socket due to use of an insufficiently unique name #447

____________________________ test_open_unix_socket _____________________________

    async def test_open_unix_socket():
>       name, serv_sock = await get_server_socket()

../.venv/lib/python3.5/site-packages/trio/tests/test_highlevel_open_unix_stream.py:50: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

    async def get_server_socket():
        name = Path() / tempfile.gettempdir() / "test.sock"
        try:
            await name.unlink()
        except OSError:
            pass
    
        serv_sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
>       serv_sock.bind(fspath(name))  # bpo-32562
E       OSError: [Errno 48] Address already in use

../.venv/lib/python3.5/site-packages/trio/tests/test_highlevel_open_unix_stream.py:24: OSError