Add cleanup for br-tun with OVS

Change-Id: I5c4d28844f40eaad622ef7590c54e0e6647c85e3
Closes-Bug: #1471390
diff --git a/lib/neutron_plugins/ovs_base b/lib/neutron_plugins/ovs_base
index ad09a73..f1f7f85 100755
--- a/lib/neutron_plugins/ovs_base
+++ b/lib/neutron_plugins/ovs_base
@@ -41,7 +41,7 @@
     done
 
     # remove all OVS bridges created by Neutron
-    for bridge in $(sudo ovs-vsctl list-br | grep -o -e ${OVS_BRIDGE} -e ${PUBLIC_BRIDGE}); do
+    for bridge in $(sudo ovs-vsctl list-br | grep -o -e ${OVS_BRIDGE} -e ${PUBLIC_BRIDGE} -e ${OVS_TUNNEL_BRIDGE}); do
         sudo ovs-vsctl del-br ${bridge}
     done
 }