udev_helper: do not run with newnet

If the system is using newnet, then we should not run to fire the
netifrc triggers.

X-Gentoo-Bug: 503530
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
Bump.

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
Merge remote-tracking branch 'upstream/master'