574101 - MODRDN request never returns - possible deadlock
    
    https://bugzilla.redhat.com/show_bug.cgi?id=574101
    
    Description: To create the ID list for child entries of to-be-renamed
    entry, an inappropriate function (idl_append) was used.  The function
    expects the passed IDs are sorted.  If not sorted, idl_insert should
    be used instead.