try primary server after retry_timeout + 1 seconds when switching to backup
    
    https://fedorahosted.org/sssd/ticket/1679
    
    The problem is when we are about to reset the server status, we don't
    get through the timeout (30 seconds) because the "switch to primary
    server" task is scheduled 30 seconds after fall back to a backup
    server. Thus the server status remains "not working" and is resetted
    after another 30 seconds.
    
    We need to make sure that the server status is tried after the
    timeout period. retry_timeout is currently hardcoded to 30, thus
    the change in man page.