Fix log directory config entry name

it does not satisfy the name regex and thus breaks the puppet run, if the log dir is set

Author: johannesschillinger-dm

manifests/server/instance/config.pp

@@ -211,7 +211,7 @@
     }
   }
   if $logdir {
-    postgresql::server::config_entry { "log_directory for instance ${name}":
+    postgresql::server::config_entry { "log_directory_for_instance_${name}":
       value => $logdir,
     }
   }