Added /etc/network/interfaces enforcement for Ubuntu 16.04

Change-Id: Icb8da3de1b847cad44772189363a606cf243e912
diff --git a/ubuntu-16.04/scripts/network.sh b/ubuntu-16.04/scripts/network.sh
new file mode 100644
index 0000000..3885590
--- /dev/null
+++ b/ubuntu-16.04/scripts/network.sh
@@ -0,0 +1,4 @@
+echo "timeout 10;
+backoff-cutoff 0;
+initial-interval 0;
+retry 15;" >> /etc/dhcp/dhclient.conf