Enable Prometheus endpoint for Calico

Change-Id: I5c4166b21aaef9de4a7eb11325958d0f93d6cbe6
diff --git a/kubernetes/pool/cluster.yml b/kubernetes/pool/cluster.yml
index b38cf07..8295d97 100644
--- a/kubernetes/pool/cluster.yml
+++ b/kubernetes/pool/cluster.yml
@@ -6,4 +6,6 @@
     pool:
       container: false
       network:
-        engine: calico
\ No newline at end of file
+        engine: calico
+        prometheus:
+          enabled: true