Add xenial param to prx and sl nodes

Change-Id: I71fc35b027496844cb509845d07ab5cc4a4567fb
diff --git a/classes/cluster/virtual-mcp11-dvr/infra/config.yml b/classes/cluster/virtual-mcp11-dvr/infra/config.yml
index caed62a..0e81862 100644
--- a/classes/cluster/virtual-mcp11-dvr/infra/config.yml
+++ b/classes/cluster/virtual-mcp11-dvr/infra/config.yml
@@ -88,4 +88,9 @@
         stacklight_server_node01:
           classes:
           - system.influxdb.server.single
-          - system.influxdb.database.stacklight
\ No newline at end of file
+          - system.influxdb.database.stacklight
+        openstack_proxy_node01:
+          classes:
+          - cluster.virtual-mcp11-dvr.openstack.proxy
+          params:
+            linux_system_codename: xenial
\ No newline at end of file