aiccu: Use the defaultroute option

[candrews]

After the rework, the aiccu script no longer obeys the "defaultroute" option. This commit fixes that problem.

Originally reported at https://dev.openwrt.org/ticket/17131

[sbyx]

@oskar456: what do you think?

[oskar456]

This is a duplicate of issue #95
Once again: Default route is added separately using neitfd proto hooks (see lines 58, 65 and 70 in aiccu.sh). The default route should not be pushed directly into main routing table, like the aiccu daemon does, because it would then break source based IPv6 routing. That's why generated aiccu config file is set always to disable the default route.

Please note that default route is not visible in main routing table. To see it, issue # ifstatus <name of aiccu interface>

[sbyx]

Thanks closing this then.