Parameterized linux_system_codename

Change-Id: Ic527bfa74b4caf7e0bb5d157bfae024f2cf53111
diff --git a/reclass/storage/system/kubernetes_control_single.yml b/reclass/storage/system/kubernetes_control_single.yml
index c88e3c3..1ce0cd5 100644
--- a/reclass/storage/system/kubernetes_control_single.yml
+++ b/reclass/storage/system/kubernetes_control_single.yml
@@ -1,6 +1,7 @@
 parameters:
   _param:
     kubernetes_control_node01_hostname: ctl01
+    kubernetes_control_system_codename: xenial
   reclass:
     storage:
       node:
@@ -11,5 +12,5 @@
           - cluster.${_param:cluster_name}.kubernetes.control
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: xenial
-            single_address: ${_param:kubernetes_control_node01_address}
\ No newline at end of file
+            linux_system_codename: ${_param:kubernetes_control_system_codename}
+            single_address: ${_param:kubernetes_control_node01_address}