[FS#321] BTHomeHub5 Type A dsl_notify.sh fails to set LED

[LEDE Bugs]

The following task has a new comment added:

FS#321 - BTHomeHub5 Type A dsl_notify.sh fails to set LED
User who did this - Mauro Mozzarelli (ezplanet)

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Clearly the above patch is useful and applicable only for routers with one LED only available to for ADSL and Internet connection that we want to share. 
Routers with 2 separate LEDs will not need this patch.
Therefore we could provide a choice on weather to have dsl_notify.sh to invert the status of UP/DOWN within the configuration (build or alternative uci)
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=321#comment1512