Parameterized linux_system_codename

Change-Id: Ic527bfa74b4caf7e0bb5d157bfae024f2cf53111
diff --git a/reclass/storage/system/physical_control_single.yml b/reclass/storage/system/physical_control_single.yml
index 32f09c3..db92c5f 100644
--- a/reclass/storage/system/physical_control_single.yml
+++ b/reclass/storage/system/physical_control_single.yml
@@ -4,6 +4,7 @@
     infra_kvm_node01_deploy_address: ${_param:infra_kvm_node01_address}
     infra_kvm_node01_storage_address: ${_param:infra_kvm_node01_address}
     infra_kvm_node01_public_address: ${_param:infra_kvm_node01_address}
+    infra_kvm_system_codename: trusty
   reclass:
     storage:
       node:
@@ -14,7 +15,7 @@
           - cluster.${_param:cluster_name}.infra.kvm
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: trusty
+            linux_system_codename: ${_param:infra_kvm_system_codename}
             single_address: ${_param:infra_kvm_node01_address}
             deploy_address: ${_param:infra_kvm_node01_deploy_address}
             public_address: ${_param:infra_kvm_node01_public_address}