[1.5.x] Correctly restore warning capture after logging tests.

        # If tests are invoke with "-Wall" (or any -W flag actually) then

        # warning logging gets disabled (see django/conf/__init__.py). However,

        # these tests expect warnings to be logged, so manually force warnings

        # to the logs.

        # to the logs. Use getattr() here because the logging capture state is

        # undocumented and (I assume) brittle.

        self._old_capture_state = bool(getattr(logging, '_warnings_showwarning', False))

        logging.captureWarnings(True)

        # this convoluted setup is to avoid printing this deprecation to

            self.logger.handlers[i].stream = self.old_streams[i]

        # Reset warnings state.

        logging.captureWarnings(False)

        logging.captureWarnings(self._old_capture_state)

    @override_settings(DEBUG=True)

    def test_warnings_capture(self):