[Nut-upsuser] NUT add on for Home Assistant

[Greg Troxel]

I did a quick experiment.

Machine A runs NetBSD 9, ups-nut 2.8.0, and Home Assistant Core
2022.8.4.  It has a ups foo.  Note there is no "nut addon" involved, or
any "addon" at all.  ("addon" is a Home Assistant concept for the Home
Assistant OS or Supervisor running progams not from Home Assistant.)

Machine A runs NetBSD 9, ups-nut 2.8.0.  It has a ups bar.

Since a long time, a year or two, the nut integration has been
configured on A to talk to foo, over the usual 127.0.0.1:3493.

I just set up an ssh tunnel to forward 3494 on A to 127.0.0.1:3493 on B.
I then added 127.0.0.1:3494 using the UI, and it appeared.  The entities
are better named, "Foo Voltage", so it appears a bunch of rough edges
are gone (which is typical in HA; just wait 6 months and things are
smoother).  I should delete and re-add my first UPS to get better names.

I then graphed some of the things together and it all seems fine.

So that's proof the integration can support two upsd servers, but you
have to be able to contact them, and there is the convention that they
listen on localhost only unless you change that.
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