Put Grafana dashboards into their own directory

Change-Id: Ifeaec141a0fb8a589ecf5abdd79399f6904b510e
diff --git a/heat/files/grafana_influxdb.json b/heat/files/grafana_dashboards/heat_influxdb.json
similarity index 100%
rename from heat/files/grafana_influxdb.json
rename to heat/files/grafana_dashboards/heat_influxdb.json
diff --git a/heat/meta/grafana.yml b/heat/meta/grafana.yml
index e1cc983..949053f 100644
--- a/heat/meta/grafana.yml
+++ b/heat/meta/grafana.yml
@@ -1,4 +1,4 @@
 dashboard:
   heat:
     format: json
-    template: heat/files/grafana_influxdb.json
+    template: heat/files/grafana_dashboards/heat_influxdb.json