[FS#509] Static IPv6 routes lost upon reboot

[LEDE Bugs]

The following task has a new comment added:

FS#509 - Static IPv6 routes lost upon reboot
User who did this - Jo-Philipp Wich (jow-)

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A short test on a TL-WDR4900 using 17.01-SNAPSHOT r3416-b1257d8 worked fine, I am unable to reproduce this problem anymore.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=509#comment2732