Search for postfix main.cf for minion ID and osrelease, too.

Signed-off-by: Maximilian Wilhelm <max@rfc2324.org>

postfix/init.sls

@@ -22,7 +22,9 @@ postfix:
 /etc/postfix/master.cf:
   file.managed:
     - source:
+      - salt://postfix/master.cf.{{ grains['id'] }}
       - salt://postfix/master.cf.{{ grains['nodename'] }}
+      - salt://postfix/master.cf.{{ grains.oscodename }}
       - salt://postfix/master.cf
     - watch_in:
       - service: postfix