enhanced reset for contiv

roles/network_plugin/contiv/files/contiv-cleanup.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -e
+echo "Starting cleanup"
+ovs-vsctl list-br | grep contiv | xargs -I % ovs-vsctl del-br %
+for p in $(ifconfig | grep vport | awk '{print $1}');
+do
+	ip link delete $p type veth
+done
+touch /tmp/cleanup.done
+sleep 60