Merge pull request #32 from thouveng/provide_system_dashboard

Provides Grafana dashboard

linux/meta/grafana.yml

@@ -0,0 +1,4 @@
+dashboard:
+  linux:
+    format: json
+    template: linux/files/grafana_influxdb.json

metadata/service/support.yml

@@ -9,3 +9,5 @@ parameters:
         enabled: true
       sphinx:
         enabled: true
+      grafana:
+        enabled: true