[Nut-upsuser] Enhanced driver troubleshooting

[Jim Klimov]

Cheers,

  With https://github.com/networkupstools/nut/pull/1906 and
https://github.com/networkupstools/nut/pull/1912 (and probably some more
later), I've been enhancing NUT driver framework with support for live
reload of configuration, primarily to acknowledge changes to debug_min
setting in ups.conf - but made in a generic fashion that specific drivers
may take advantage of for their `addvar`'ed options handling (as a separate
effort from users/maintainers of those drivers).

  Live testing and other forms of review would be welcome :)

Jim
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