Run dispatch script for all unmanaged devices
Run dispatch script for all unmanaged devices

Instead of parsing os-net-config, we should be running this script for
all the unmanaged devices. The 99-origin-dns.sh script doesn't care
whether the device is managed by NM or not, what it cares about is
whether the device is the one used for the default route.

Change-Id: I2cc0bc8179c51222616706aceaa99112af4c3fd8

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates