Replaced underscores with hyphens in cluster names and domains

Change-Id: I90d163602a0915b23f25f9f4d799799c0336e664
diff --git a/classes/cluster/k8s-aio-contrail/infra/init.yml b/classes/cluster/k8s-aio-contrail/infra/init.yml
index d10b0d4..ec7c359 100644
--- a/classes/cluster/k8s-aio-contrail/infra/init.yml
+++ b/classes/cluster/k8s-aio-contrail/infra/init.yml
@@ -16,7 +16,7 @@
     infra_config_deploy_address: 192.168.10.90
 
     cluster_domain: k8s-aio-contrail.local
-    cluster_name: k8s_aio_contrail
+    cluster_name: k8s-aio-contrail
     apt_mk_version: nightly
   linux:
     network: