Put Grafana dashboards into their own directory

Change-Id: Ieace6aed0503b0bb461ebff3f8afc325618d3bbf
diff --git a/cinder/files/grafana_influxdb.json b/cinder/files/grafana_dashboards/cinder_influxdb.json
similarity index 100%
rename from cinder/files/grafana_influxdb.json
rename to cinder/files/grafana_dashboards/cinder_influxdb.json
diff --git a/cinder/meta/grafana.yml b/cinder/meta/grafana.yml
index 282fad8..4a390f5 100644
--- a/cinder/meta/grafana.yml
+++ b/cinder/meta/grafana.yml
@@ -1,4 +1,4 @@
 dashboard:
   cinder:
     format: json
-    template: cinder/files/grafana_influxdb.json
+    template: cinder/files/grafana_dashboards/cinder_influxdb.json