New variable kubernetes_cluster_domain

Use cluster_domain/domain variable consistently across all templated files.
All kubeconfig fields contain cluster domain for uniqueness.

Using kubernetes_cluster_domain param now to allow physical servers
to have a different domain from kubernetes cluster if necessary, but
the default keeps them the same.

Change-Id: Ic1e571dc92166b8b603214367f10382fb0ff04b7
diff --git a/tests/pillar/master_contrail.sls b/tests/pillar/master_contrail.sls
index c237389..7cf9d68 100644
--- a/tests/pillar/master_contrail.sls
+++ b/tests/pillar/master_contrail.sls
@@ -1,5 +1,6 @@
 kubernetes:
   common:
+    cluster_domain: cluster.local
     network:
       engine: opencontrail
     hyperkube: