[FS#1065] 6to4 INVALID_LOCAL_ADDRESS protocol reconfiguration loop

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - bolvan (bolvan) 

Attached to Project - LEDE Project
Summary - 6to4 INVALID_LOCAL_ADDRESS  protocol reconfiguration loop
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Reboot (SNAPSHOT, r5049-efbd4e7)

When 6to4 interface is up  and wan receives LAN address (10.x,192.168.x)
100% cpu consuming loop happens. Netifd starts again and again configuration script.
Its likely more paths exist to reproduce same problem.
every proto_notify_error + return  can cause netifd to restart proto setup immediately

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1065