Fix k8s master/pool enabled parameters

Change-Id: I526c7bab57016962c8d435ff7fb4d22d9eca0704
diff --git a/kubernetes/master/single.yml b/kubernetes/master/single.yml
index 8d75ca2..1898549 100644
--- a/kubernetes/master/single.yml
+++ b/kubernetes/master/single.yml
@@ -1,3 +1,7 @@
 classes:
 - service.kubernetes.master.single
 - system.kubernetes.common
+parameters:
+  kubernetes:
+    master:
+      enabled: true