Glances support for system stats

[WaaromZoMoeilijk]

Would be great to have Glances in Server mode reporting to an MQTT broker.

• System stats
• Docker stats
• No need for a seperate Glances intergration.
• Reuse MQTT credentials. https://glances.readthedocs.io/en/stable/gw/mqtt.html
• Subdir sensor.unraid_server_system_x or something right?

[WaaromZoMoeilijk]

https://github.com/Cyanlabs/jsonapi-unraid https://glances.readthedocs.io/en/stable/install.html