add key to log_directory config entry

Author: johannesschillinger-dm

manifests/server/instance/config.pp

@@ -212,6 +212,7 @@
   }
   if $logdir {
     postgresql::server::config_entry { "log_directory_for_instance_${name}":
+      key   => 'log_directory',
       value => $logdir,
     }
   }