Fix grain structure

Change-Id: Icef4e4aaaadffbd9db81c32108e13d58051106f4
diff --git a/grafana/meta/salt.yml b/grafana/meta/salt.yml
index 9e6d273..b809aed 100644
--- a/grafana/meta/salt.yml
+++ b/grafana/meta/salt.yml
@@ -11,7 +11,8 @@
     {%- endfor %}
 grain:
   grafana:
-    {{ service_grains|yaml(False)|indent(4) }}
+    grafana:
+      {{ service_grains|yaml(False)|indent(6) }}
   {%- endif %}
 {%- endif %}