[Nut-upsuser] Tripp Lite SMART1500LCD will not stay shut down when power is disconnected

[Ken Olum]

Hi, Layne.  Glad my changes helped.

It's not surprising that there are some remaining race conditions.  I'm
afraid I can't remember whether I have this particular problem or not.
My variable settings shown by upsc are below.

I think the general plan should be to run the system on the UPS for as
long as possible, then shut it down with the shortest delay possible
that still allows for a clean shutdown of your system.  If these times
are, say, 10 minutes and 10 seconds, then you only encounter the race if
the power happens to be off for an interval between 0:10:00 and 0:10:10,
which is quite unlikely.

Actually fixing all races would be better still, but I do not have a
good enough understanding of how my UPS handles the various settings to
be able to do that.

                                        Ken

battery.charge: 100
battery.runtime: 4050
battery.type: PbAC
battery.voltage: 13.4
battery.voltage.nominal: 12.0
device.mfr: Tripp Lite 
device.model: Tripp Lite UPS 
device.type: ups
driver.name: usbhid-ups
driver.parameter.offdelay: 10
driver.parameter.ondelay: 50
driver.parameter.pollfreq: 30
driver.parameter.pollinterval: 2
driver.parameter.port: auto
driver.parameter.synchronous: no
driver.version: 2.7.4-476-g6b9971a7
driver.version.data: TrippLite HID 0.82
driver.version.internal: 0.42
input.frequency: 60.0
input.voltage: 118.2
input.voltage.nominal: 120
output.frequency.nominal: 60
output.voltage.nominal: 120
ups.beeper.status: disabled
ups.delay.shutdown: 10
ups.mfr: Tripp Lite 
ups.model: Tripp Lite UPS 
ups.power.nominal: 450
ups.productid: 2010
ups.status: OL
ups.timer.reboot: 65535
ups.timer.shutdown: 65535
ups.vendorid: 09ae
ups.watchdog.status: 0