Parameterized linux_system_codename

Change-Id: Ic527bfa74b4caf7e0bb5d157bfae024f2cf53111
diff --git a/reclass/storage/system/openstack_proxy_cluster.yml b/reclass/storage/system/openstack_proxy_cluster.yml
index 95439fa..ca0b2a9 100644
--- a/reclass/storage/system/openstack_proxy_cluster.yml
+++ b/reclass/storage/system/openstack_proxy_cluster.yml
@@ -2,6 +2,7 @@
   _param:
     openstack_proxy_node01_hostname: prx01
     openstack_proxy_node02_hostname: prx02
+    openstack_proxy_system_codename: trusty
   reclass:
     storage:
       node:
@@ -12,7 +13,7 @@
           - cluster.${_param:cluster_name}.openstack.proxy
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: trusty
+            linux_system_codename: ${_param:openstack_proxy_system_codename}
             single_address: ${_param:openstack_proxy_node01_address}
             keepalived_vip_priority: 102
         openstack_proxy_node02:
@@ -22,6 +23,6 @@
           - cluster.${_param:cluster_name}.openstack.proxy
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: trusty
+            linux_system_codename: ${_param:openstack_proxy_system_codename}
             single_address: ${_param:openstack_proxy_node02_address}
             keepalived_vip_priority: 101