Fix monitoring setup script.

Remove the firewall rule created for monitoring as part of kube-down.
Reuse master auth for Grafana.

cluster/kube-down.sh

@@ -27,6 +27,7 @@ source "${KUBE_ROOT}/cluster/${KUBERNETES_PROVIDER}/util.sh"
 echo "Bringing down cluster using provider: $KUBERNETES_PROVIDER"
 
 verify-prereqs
+teardown-monitoring
 kube-down
 
 echo "Done"