Parameterized linux_system_codename

Change-Id: Ic527bfa74b4caf7e0bb5d157bfae024f2cf53111
diff --git a/reclass/storage/system/openstack_control_cluster.yml b/reclass/storage/system/openstack_control_cluster.yml
index deb25b8..300a04c 100644
--- a/reclass/storage/system/openstack_control_cluster.yml
+++ b/reclass/storage/system/openstack_control_cluster.yml
@@ -3,6 +3,7 @@
     openstack_control_node01_hostname: ctl01
     openstack_control_node02_hostname: ctl02
     openstack_control_node03_hostname: ctl03
+    openstack_control_system_codename: trusty
   reclass:
     storage:
       node:
@@ -13,7 +14,7 @@
           - cluster.${_param:cluster_name}.openstack.control
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: trusty
+            linux_system_codename: ${_param:openstack_control_system_codename}
             single_address: ${_param:openstack_control_node01_address}
             keepalived_vip_priority: 103
             opencontrail_database_id: 1
@@ -25,7 +26,7 @@
           - cluster.${_param:cluster_name}.openstack.control
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: trusty
+            linux_system_codename: ${_param:openstack_control_system_codename}
             single_address: ${_param:openstack_control_node02_address}
             keepalived_vip_priority: 102
             opencontrail_database_id: 2
@@ -37,7 +38,7 @@
           - cluster.${_param:cluster_name}.openstack.control
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: trusty
+            linux_system_codename: ${_param:openstack_control_system_codename}
             single_address: ${_param:openstack_control_node03_address}
             keepalived_vip_priority: 101
             opencontrail_database_id: 3