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/metadata/service/master/cluster.yml b/metadata/service/master/cluster.yml
index e969046..f755401 100644
--- a/metadata/service/master/cluster.yml
+++ b/metadata/service/master/cluster.yml
@@ -40,7 +40,7 @@
           replicas: 1
           autoscaler:
             enabled: true
-          domain: cluster.local
+          domain: ${_param:kubernetes_cluster_domain}
           server: 10.254.0.10
           dnsmasq:
             cache-size: 1000
diff --git a/metadata/service/master/single.yml b/metadata/service/master/single.yml
index 524737e..00dff34 100644
--- a/metadata/service/master/single.yml
+++ b/metadata/service/master/single.yml
@@ -35,7 +35,7 @@
           replicas: 1
           autoscaler:
             enabled: true
-          domain: cluster.local
+          domain: ${_param:kubernetes_cluster_domain}
           server: 10.254.0.10
           dnsmasq:
             cache-size: 1000