Fix amateur level mistake.

Happy Friday!

Change-Id: I2b1112ce74577d6e3d50c5ea2131d46c77307571
diff --git a/lib/neutron b/lib/neutron
index ba26c5f..ad68d8e 100644
--- a/lib/neutron
+++ b/lib/neutron
@@ -242,7 +242,7 @@
 
     # Metering
     if is_service_enabled neutron-metering; then
-        source $TOP_DIR/neutron_plugins/services/metering
+        source $TOP_DIR/lib/neutron_plugins/services/metering
         neutron_agent_metering_configure_common
         neutron_agent_metering_configure_agent
     fi