[FS#829] network.sh incorrectly hardcodes IPv6 address suffix

[LEDE Bugs]

The following task has a new comment added:

FS#829 - network.sh incorrectly hardcodes IPv6 address suffix 
User who did this - Jo-Philipp Wich (jow-)

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Fixed with http://git.lede-project.org/7f91cabd0d (master) and http://git.lede-project.org/df4363b607 (lede-17.01)
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=829#comment2764