Use configured values instead of default value

Variables PUBLIC_INTERFACE_DEFAULT and GUEST_INTERFACE_DEFAULT
are only use to provide default value, deployment script should
not use such values directly

Closes-Bug: #1566768

Change-Id: Ib543b416df861086fa2edbe7df769b224d0b0add
diff --git a/lib/neutron_plugins/openvswitch_agent b/lib/neutron_plugins/openvswitch_agent
index 339d5fd..aba2587 100644
--- a/lib/neutron_plugins/openvswitch_agent
+++ b/lib/neutron_plugins/openvswitch_agent
@@ -96,17 +96,17 @@
 
         # Set up domU's L2 agent:
 
-        # Create a bridge "br-$GUEST_INTERFACE_DEFAULT"
-        _neutron_ovs_base_add_bridge "br-$GUEST_INTERFACE_DEFAULT"
-        # Add $GUEST_INTERFACE_DEFAULT to that bridge
-        sudo ovs-vsctl -- --may-exist add-port "br-$GUEST_INTERFACE_DEFAULT" $GUEST_INTERFACE_DEFAULT
+        # Create a bridge "br-$VLAN_INTERFACE"
+        _neutron_ovs_base_add_bridge "br-$VLAN_INTERFACE"
+        # Add $VLAN_INTERFACE to that bridge
+        sudo ovs-vsctl -- --may-exist add-port "br-$VLAN_INTERFACE" $VLAN_INTERFACE
 
         # Create external bridge and add port
         _neutron_ovs_base_add_bridge $PUBLIC_BRIDGE
-        sudo ovs-vsctl -- --may-exist add-port $PUBLIC_BRIDGE $PUBLIC_INTERFACE_DEFAULT
+        sudo ovs-vsctl -- --may-exist add-port $PUBLIC_BRIDGE $PUBLIC_INTERFACE
 
         # Set bridge mappings to "physnet1:br-$GUEST_INTERFACE_DEFAULT"
-        iniset "/$Q_PLUGIN_CONF_FILE.domU" ovs bridge_mappings "physnet1:br-$GUEST_INTERFACE_DEFAULT,physnet-ex:$PUBLIC_BRIDGE"
+        iniset "/$Q_PLUGIN_CONF_FILE.domU" ovs bridge_mappings "physnet1:br-$VLAN_INTERFACE,physnet-ex:$PUBLIC_BRIDGE"
         # Set integration bridge to domU's
         iniset "/$Q_PLUGIN_CONF_FILE.domU" ovs integration_bridge $OVS_BRIDGE
         # Set root wrap