Enable system.defaults on all root-init

Change-Id: If093d365a9f3942bea9cc2777f90d25753bb805f
diff --git a/classes/cluster/sl-k8s-contrail/init.yml b/classes/cluster/sl-k8s-contrail/init.yml
index 2e194af..02a6712 100644
--- a/classes/cluster/sl-k8s-contrail/init.yml
+++ b/classes/cluster/sl-k8s-contrail/init.yml
@@ -1,4 +1,5 @@
 classes:
+- system.defaults
 - system.linux.network.dynamic_hosts
 - system.linux.system.single
 - cluster.sl-k8s-contrail.kubernetes