Remove parameter to freemem pup-class.

manifests/freemem.pp

 define motd::freemem (
-  $total_memory,
   Integer $id = 99,
 ) {
   motd { $name:
     id      => $id,
-    content => epp('motd/freemem.epp', {
-      total_memory => $total_memory,
-    }),
+    content => epp('motd/freemem.epp', { }),
   }
 }