[FS#463] up/down on a usbnet interfaces fails to reassign ULA addresses

[LEDE Bugs]

The following task has a new comment added:

FS#463 - up/down on a usbnet interfaces fails to reassign ULA addresses
User who did this - Dave Täht (dtaht)

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ifdown/ifup (does not reassign the ipv6 addr), to clarify.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=463#comment1605