fix model domains to valid names

Change-Id: Ia89d35ffb204401ac05c11ac877a9a3b69e56745
diff --git a/classes/cluster/sl_os_contrail/infra/init.yml b/classes/cluster/sl_os_contrail/infra/init.yml
index 38ef139..893c1d4 100755
--- a/classes/cluster/sl_os_contrail/infra/init.yml
+++ b/classes/cluster/sl_os_contrail/infra/init.yml
@@ -1,6 +1,6 @@
 parameters:
   _param:
-    cluster_domain: sl_os_contrail.local
+    cluster_domain: sl-os-contrail.local
     cluster_name: sl_os_contrail
     infra_config_deploy_address: 192.168.10.100
     infra_config_address: 172.16.10.100