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
(cherry picked from commit 790ca5ce32)

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