fwts brightness - monitor hotkey events should have a delay

[HsuanYi Lin]

I think this fail is caused by the timing sequence.
After the hotkey is triggered, the brightness is get and set by the fwts functions earlier than the hotkey event:

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if (brightness_wait_event(fw) == 0)
    fwts_failed(fw, LOG_LEVEL_HIGH,
        "BrightnessNoHotKey",
        "Did not detect ACPI hotkey event.");
else {
    int new_brightness;

    if (brightness_get_setting(entry->d_name, "actual_brightness", &new_brightness) != FWTS_OK) {
        fwts_failed(fw, LOG_LEVEL_HIGH,
            "BrightnessNotExist",
            "Actual brightness could not be accessed for %s.",
            entry->d_name);
    } else {
        if (new_brightness > 0)
            fwts_passed(fw, "Brightness increased on UP hotkey for %s.", entry->d_name);
        else
            fwts_failed(fw, LOG_LEVEL_HIGH,
                "BrightnessNoIncrease",
                "Did not see brightness increased for %s.",
                entry->d_name);
    }
}

tmp = (saved_brightness > 0) ? saved_brightness : 1;
brightness_set_setting(entry->d_name, "brightness", tmp);
fwts_printf(fw, "==== Press the brightness DOWN hotkey for %s ====\n", entry->d_name);
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Maybe it should have a delay after brightness_wait_event.