fixed linux_system_codename (xenial) in reclass.storage.system.openstack_dns_cluster
diff --git a/reclass/storage/system/openstack_dns_cluster.yml b/reclass/storage/system/openstack_dns_cluster.yml
index d134c88..d671e78 100644
--- a/reclass/storage/system/openstack_dns_cluster.yml
+++ b/reclass/storage/system/openstack_dns_cluster.yml
@@ -12,7 +12,7 @@
           - cluster.${_param:cluster_name}.openstack.dns
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: trusty
+            linux_system_codename: xenial
             single_address: ${_param:openstack_dns_node01_address}
             keepalived_vip_priority: 110
         openstack_dns_node02:
@@ -22,6 +22,6 @@
           - cluster.${_param:cluster_name}.openstack.dns
           params:
             salt_master_host: ${_param:reclass_config_master}
-            linux_system_codename: trusty
+            linux_system_codename: xenial
             single_address: ${_param:openstack_dns_node02_address}
             keepalived_vip_priority: 111