Backport add clusters and replicas to sample model file

Author: rjeberhard

kubernetes/samples/scripts/create-weblogic-domain/domain-home-on-pv/wdt_k8s_model_template.yaml

@@ -93,10 +93,9 @@ kubernetes:
 
     # clusters is used to configure the desired behavior for starting member servers of a cluster.
     # If you use this entry, then the rules will be applied to ALL servers that are members of the named clusters.
-    #clusters:
-    # '@@PROP:clusterName@@':
-    #   serverStartState: "RUNNING"
-    #   replicas: %INITIAL_MANAGED_SERVER_REPLICAS%
+    clusters:
+    - clusterName: %CLUSTER_NAME%
+      replicas: %INITIAL_MANAGED_SERVER_REPLICAS%
 
     # Istio service mesh support is experimental.
     %ISTIO_PREFIX%configuration: