Werk #11121: Proxmox: add node info check

Component	Checks & agents
Title	Proxmox: add node info check
Date	May 4, 2020
Level	Prominent Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This check is OK when a given Proxmox node's status and it's subscription 'status' match the given configured values, WARN otherwise. It shows the node status, subscription status, Proxmox version and number of hosted VMs.

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