parametrize os version for gtw and cmp
diff --git a/reclass/storage/system/openstack_gateway_single.yml b/reclass/storage/system/openstack_gateway_single.yml
index ebb9195..6f18571 100644
--- a/reclass/storage/system/openstack_gateway_single.yml
+++ b/reclass/storage/system/openstack_gateway_single.yml
@@ -11,5 +11,5 @@
           - cluster.${_param:cluster_name}.openstack.gateway
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: trusty
+            linux_system_codename: ${_param:linux_system_codename}
             single_address: ${_param:openstack_gateway_address}
\ No newline at end of file