logger => use-parent-handlers is always true in the management model

<logger category="jacorb" use-parent-handlers="false"/>

[standalone@localhost:9999 logger=jacorb] /subsystem=logging/logger=jacorb/:read-resource
{
    "outcome" => "success",
    "result" => {
        "category" => "jacorb",
        "handlers" => undefined,
        "level" => "INFO",
        "use-parent-handlers" => true
    }
}