add latest git master

[iec61131]

• Uplift NUT version
• [Updated] to latest version, [Improved] watch uspc client as entry point
• [Fixed] pollonly for liebert

[iec61131]

docker version
assuming udev rule maps /dev/liebert to /dev/bus/usb...

docker run -p 3493:3493 --name=upsdebug -d --restart unless-stopped --log-driver local --log-opt max-size=10m --device $(realpath /dev/liebert) iec61131/nut-docker:debug

[iec61131]