Add a Tunnel end-point variable for Neutron configuration

The HOST_IP address is being used as IP address
for end-point tunnel configruation. A new variable is
needed to specify a different IP address for the tunnel
end-point that Neutron will use

Change-Id: Ic7fb4853df167e78bf882af6a712b903db754dc2
Closes-bug: #1340433
diff --git a/lib/neutron_plugins/ml2 b/lib/neutron_plugins/ml2
index 9966373..8e131bb 100644
--- a/lib/neutron_plugins/ml2
+++ b/lib/neutron_plugins/ml2
@@ -99,7 +99,7 @@
     fi
 
     # Since we enable the tunnel TypeDrivers, also enable a local_ip
-    iniset /$Q_PLUGIN_CONF_FILE ovs local_ip $HOST_IP
+    iniset /$Q_PLUGIN_CONF_FILE ovs local_ip $TUNNEL_ENDPOINT_IP
 
     populate_ml2_config /$Q_PLUGIN_CONF_FILE ml2 mechanism_drivers=$Q_ML2_PLUGIN_MECHANISM_DRIVERS