If the kernel is NFS-booting, it is critical that we don't down the
slave interfaces when we activate the bond. To do so will break the root
filesystem when networking is temporarily lost.
Reported-by: Walter <walter@pratyeka.org>
X-Gentoo-Bug: 428604
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=428604
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>