Make systemd diaspora-web.service template configurable

diaspora/defaults.yaml

@@ -1,4 +1,6 @@
 diaspora:
+  systemd:
+    web_template: salt://diaspora/files/diaspora-web.service
   repository: git://github.com/diaspora/diaspora.git
   version: master
   install_path: /srv/diaspora

diaspora/service.sls

@@ -17,7 +17,7 @@ include:
   file.managed:
     - user: root
     - mode: 644
-    - source: salt://diaspora/files/diaspora-web.service
+    - source: {{ diaspora.systemd.web_template }}
     - template: jinja
     - context:
         diaspora: {{ diaspora|json }}