Fix k8s master/pool enabled parameters

Change-Id: I526c7bab57016962c8d435ff7fb4d22d9eca0704
diff --git a/kubernetes/pool/single.yml b/kubernetes/pool/single.yml
index 4e8c8ab..06178df 100644
--- a/kubernetes/pool/single.yml
+++ b/kubernetes/pool/single.yml
@@ -3,6 +3,9 @@
 - service.docker.host
 - system.kubernetes.common
 parameters:
+  kubernetes:
+    pool:
+      enabled: true
   docker:
     host:
       options: