Parameterized linux_system_codename

Change-Id: Ic527bfa74b4caf7e0bb5d157bfae024f2cf53111
diff --git a/reclass/storage/system/stacklight_telemetry_single.yml b/reclass/storage/system/stacklight_telemetry_single.yml
index bc51b30..239ae0f 100644
--- a/reclass/storage/system/stacklight_telemetry_single.yml
+++ b/reclass/storage/system/stacklight_telemetry_single.yml
@@ -1,6 +1,7 @@
 parameters:
   _param:
     stacklight_telemetry_node01_hostname: mtr01
+    stacklight_telemetry_system_codename: xenial
   reclass:
     storage:
       node:
@@ -11,6 +12,6 @@
           - cluster.${_param:cluster_name}.stacklight.telemetry
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: xenial
+            linux_system_codename: ${_param:stacklight_telemetry_system_codename}
             single_address: ${_param:stacklight_telemetry_node01_address}
-            keepalived_vip_priority: 103
\ No newline at end of file
+            keepalived_vip_priority: 103