Possibility to set list of table attributes which will be added to _del command
    
    'additional_table_attrs' can contain array of names of columns. Value from each
    column with its name will be added to the batch _del command. in case that
    the column with set name does not exists - the name is skipped.
    
    Part of: https://fedorahosted.org/freeipa/ticket/5426
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>