list_usb_devices also displays NUT addon configuration

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Proposed Changes

When enabling list_usb_devices option, also call nut-scanner -U, beside from lsusb, to detect supported USB devices and output the expected configuration. This should improve NUT addon usability and supportability

Related Issues

([Github link][autolink-references] to related issues or pull requests)

[autolink-references]: #333 #322

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Additional notes:

• only unit tested in a specific docker (I don't yet know how to clone a local container on rpi).
  Still, not much harm in blind coding and executing this :D
• expected output:

...
[20:30:26] INFO: Connected USB devices:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 17ef:6018 Lenovo Lenovo Low Profile USB Keyboard
Bus 001 Device 004: ID 0463:ffff MGE UPS Systems UPS
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 005: ID 0463:ffff ...
Bus 001 Device 004: ID 0463:ffff ...
NUT USB UPS configuration:
Scanning USB bus.
[nutdev1]
driver = "usbhid-ups"
port = "auto"
vendorid = "0463"
productid = "FFFF"
product = "Protection Station"
serial = "XXXXXXXXXXX"
vendor = "EATON"
bus = "001"
[nutdev2]
driver = "usbhid-ups"
port = "auto"
vendorid = "0463"
productid = "FFFF"
product = "Ellipse ECO"
serial = "YYYYYYYYYYY"
vendor = "EATON"
bus = "001"
...

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Reference: networkupstools/nut#2220

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closing in favor of the new SmartNUT Add-on: https://github.com/aquette/addon-smartnut/blob/main/smartnut/DOCS.md