[FS#31] firewall3 fails to reload iptables policy extension

[LEDE Bugs]

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FS#31 - firewall3 fails to reload iptables policy extension
User who did this: Jo-Philipp Wich (jow-)
Status: Assigned -> Requires testing

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=31