MT#33035 Make user.log optional

It's an often error after upgrade that this file is missing.
It happens because right after reboot there is no such file and it's not
created by logrotate because we use missingok, notifempty option for
it.

So make it optional.

Change-Id: I4ee18e8ba5e93d19e4b80fd3fcf8197d144f1ea3

templates/135_filesys-logfiles.yaml.tt2

@@ -35,8 +35,12 @@ file:
     group: adm
     filetype: file
 
+
   /var/log/user.log:
-    exists: true
+    exists:
+      or:
+        - true
+        - false
     mode: "0640"
     owner: root
     group: adm