Support stretch + ascii in __grafana_dashboard

cdist/conf/type/__grafana_dashboard/manifest

@@ -20,7 +20,23 @@ case $os in
 
                 require="__apt_source/grafana __package/apt-transport-https" __package grafana
                 require="__package/grafana" __start_on_boot grafana-server
-            ;;
+                ;;
+            9*|ascii/ceres)
+                __apt_key_uri grafana \
+                   --name 'Grafana Release Signing Key' \
+                   --uri https://packagecloud.io/gpg.key
+
+                require="__apt_key_uri/grafana" __apt_source grafana \
+                   --uri https://packagecloud.io/grafana/stable/debian/ \
+                   --distribution stretch \
+                   --component main
+
+                __package apt-transport-https
+
+                require="__apt_source/grafana __package/apt-transport-https" __package grafana
+                require="__package/grafana" __start_on_boot grafana-server
+                ;;
+
             *)
                 echo "Don't know how to install Grafana on $os $os_version. Send us a pull request!"
                 exit 1

docs/changelog

@@ -15,6 +15,7 @@ next:
 	* Core: Support in-distribution config file (Darko Poljak)
 	* New type: __apt_default_release (Matthijs Kooijman)
 	* Type __file: Add pre-exists state (Matthijs Kooijman)
+	* Type __grafana_dashboard: Add support for stretch + ascii (Nico Schottelius)
 
 4.8.0: 2018-02-14
 	* Core: Skip empty lines in parameter files (Darko Poljak)