[FS#1381] busybox: Enable ip_tunnel and ip_neighbor by default

[LEDE Bugs]

The following task has a new comment added:

FS#1381 - busybox: Enable ip_tunnel and ip_neighbor by default
User who did this - Jo-Philipp Wich (jow-)

----------
You cna install the "ip-tiny" or "ip-full" packages to gain further functionality.
----------

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1381#comment4378