Install batctl from backports

batman_adv/batctl.sls

 ---
-include:
-  - apt.repository.sid
-
 batctl:
   pkg.installed:
-    - fromrepo: sid
-    - require:
-      - pkgrepo: sid
+    - fromrepo: {{ grains['oscodename'] }}-backports
 
-batctl-apt-pin:
-  file.accumulated:
-    - name: apt.sid.pinning_exceptions
-    - filename: /etc/apt/preferences.d/sid-pinning
-    - text: batctl
-    - require_in:
-      - file: /etc/apt/preferences.d/sid-pinning
+/etc/apt/preferences.d/backports-batctl:
+  file.managed:
+    - contents: |
+        Package: batctl
+        Pin: release n={{ grains['oscodename'] }}-backports
+        Pin-Priority: 900