TT#47113 Fix check of nginx logs

The ownership of nginx logs is www-data:adm. Also check empty files to
catch wrong permissions as soon as possible.

Change-Id: Icb9e1e1c9590bbef7021e3826a19419f7c21f9ce

templates/135_filesys-logfiles.yaml.tt2

@@ -118,21 +118,21 @@ command:
       - '!/./'
 [% END -%]
 
-  "if test -e /var/log/ngcp/nginx/; then find /var/log/ngcp/nginx/ -type f -size +0 -perm /o+rwx; fi":
+  "if test -e /var/log/ngcp/nginx/; then find /var/log/ngcp/nginx/ -type f -perm /o+rwx; fi":
     exit-status: 0
     stdout:
       - '!/./'
     stderr:
       - '!/./'
 
-  "if test -e /var/log/ngcp/nginx/; then find /var/log/ngcp/nginx/ -size +0 -type f ! -user www-data; fi":
+  "if test -e /var/log/ngcp/nginx/; then find /var/log/ngcp/nginx/ -type f ! -user www-data; fi":
     exit-status: 0
     stdout:
       - '!/./'
     stderr:
       - '!/./'
 
-  "if test -e /var/log/ngcp/nginx/; then find /var/log/ngcp/nginx/ -size +0 -type f ! -group adm; fi":
+  "if test -e /var/log/ngcp/nginx/; then find /var/log/ngcp/nginx/ -type f ! -group adm; fi":
     exit-status: 0
     stdout:
       - '!/./'