Fix for IPoIB over lagg(4).
Need to update both link layer address and broadcast address when active link changes for IP over infiniband.
This is because the broadcast address contains the so-called P-key, which is interface dependent.
Reviewed by: kib @
Differential Revision: https://reviews.freebsd.org/D27658
Sponsored by: Mellanox Technologies // NVIDIA Networking
Git Hash: 5a6dd9d6f4f8e9cfa084edc36ca650375ba4a322
Git Author: hselasky@FreeBSD.org