SDAP: refactor sdap_access_filter_done
    
    As preparation for ticket #2364 move code from sdap_access_filter_done()
    into sdap_access_done() to make its reuse possible and thus avoid code
    duplication.
    
    Rename check_next_rule() to sdap_access_check_next_rule().
    
    Update definition order of tevent-using functions by time of execution.
    
    Reviewed-by: Pavel Březina <pbrezina@redhat.com>