watchdog timeout configuration
    
    Make the watchdog timeout configurable.  The watchdog device must
    support the configured value, and all hosts must use the same value.
    The io_timeout should usually be configured by a similar factor.
    
    Set watchdog_fire_timeout and io_timeout in sanlock.conf, e.g.
    watchdog_fire_timeout=30
    io_timeout=5
    
    The defaults remain watchdog_fire_timeout 60 and io_timeout 10.
    
    wdmd --probe can be used with --timeout N to test if the watchdog
    device supports timeout value N.