Fix Prometheus dashboard

Change-Id: Ia8de22163a3b1635b40664f517da2f9aea9fa76c
diff --git a/etcd/files/grafana_dashboards/etcd_prometheus.json b/etcd/files/grafana_dashboards/etcd_prometheus.json
index 2bdff24..bed4cf7 100644
--- a/etcd/files/grafana_dashboards/etcd_prometheus.json
+++ b/etcd/files/grafana_dashboards/etcd_prometheus.json
@@ -1,3 +1,4 @@
+{%- raw %}
 {
   "annotations": {
     "list": []
@@ -793,3 +794,4 @@
   "title": "Etcd Cluster",
   "version": 0
 }
+{%- endraw %}