Add a script to get the next hop in a route.

I never remember the incantation, and its slightly different between FreeBSD and Linux so I am adding this script essentially as a note.

ansible/roles/network/files/next_hop_freebsd.bash

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+#
+set -euo pipefail
+IFS=$'\n\t'
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+exec route get "${@}"