daemon: extend grace time
    
    Increase the default grace time for a killpath instance
    from 30 to 40 seconds based on a corrected analysis of
    the recovery sequence.  The period during which the
    watchdog may fire is determined by the wdmd check
    interval (10 seconds), not the sanlock renewal interval.
    
    Signed-off-by: David Teigland <teigland@redhat.com>