Use Q_PORT variable rather than hardcoded port

Change-Id: I647c6bdf14f2551bd120821a16044cec2b03b197
closes-bug: 1348834
diff --git a/lib/neutron b/lib/neutron
index 98ae3ac..06e26b7 100644
--- a/lib/neutron
+++ b/lib/neutron
@@ -386,9 +386,9 @@
                 "network" "Neutron Service")
             get_or_create_endpoint $NEUTRON_SERVICE \
                 "$REGION_NAME" \
-                "http://$SERVICE_HOST:9696/" \
-                "http://$SERVICE_HOST:9696/" \
-                "http://$SERVICE_HOST:9696/"
+                "http://$SERVICE_HOST:$Q_PORT/" \
+                "http://$SERVICE_HOST:$Q_PORT/" \
+                "http://$SERVICE_HOST:$Q_PORT/"
         fi
     fi
 }