Parameterized linux_system_codename

Change-Id: Ic527bfa74b4caf7e0bb5d157bfae024f2cf53111
diff --git a/reclass/storage/system/stacklight_log_cluster.yml b/reclass/storage/system/stacklight_log_cluster.yml
index bbb6a6b..14b8108 100644
--- a/reclass/storage/system/stacklight_log_cluster.yml
+++ b/reclass/storage/system/stacklight_log_cluster.yml
@@ -3,6 +3,7 @@
     stacklight_log_node01_hostname: log01
     stacklight_log_node02_hostname: log02
     stacklight_log_node03_hostname: log03
+    stacklight_log_system_codename: xenial
   reclass:
     storage:
       node:
@@ -14,7 +15,7 @@
           - cluster.${_param:cluster_name}.stacklight.log_curator
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: xenial
+            linux_system_codename: ${_param:stacklight_log_system_codename}
             single_address: ${_param:stacklight_log_node01_address}
             keepalived_vip_priority: 103
         stacklight_log_node02:
@@ -25,7 +26,7 @@
           - cluster.${_param:cluster_name}.stacklight.log_curator
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: xenial
+            linux_system_codename: ${_param:stacklight_log_system_codename}
             single_address: ${_param:stacklight_log_node02_address}
             keepalived_vip_priority: 102
         stacklight_log_node03:
@@ -36,6 +37,6 @@
           - cluster.${_param:cluster_name}.stacklight.log_curator
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: xenial
+            linux_system_codename: ${_param:stacklight_log_system_codename}
             single_address: ${_param:stacklight_log_node03_address}
             keepalived_vip_priority: 101