TT#47113 Change owner of nginx logs

Now nginx uses rsyslog for logging but all logs processed by rsyslog
have root:adm ownership so change the test accordingly.

Change-Id: I902f6a588ea60c5a0412a1c0a59fc74a2e36faa8

templates/135_filesys-logfiles.yaml.tt2

@@ -125,7 +125,7 @@ command:
     stderr:
       - '!/./'
 
-  "if test -e /var/log/ngcp/nginx/; then find /var/log/ngcp/nginx/ -type f ! -user www-data; fi":
+  "if test -e /var/log/ngcp/nginx/; then find /var/log/ngcp/nginx/ -type f ! -user root; fi":
     exit-status: 0
     stdout:
       - '!/./'