Checkmk Werk 11786: proxmox_ve_disk_usage: use same metrics and summary as df checks

ID: 11786 Title: proxmox_ve_disk_usage: use same metrics and summary as df checks Component: Checks & agents Level: 1 Class: New feature Version: 2.1.0i1 proxmox_ve_disk_usage summary and metrics have been very sparse, not including FS size or percentage of usage. This changes makes the check output look like other df based checks including {{fs_used}}, {{fs_size}} and {{fs_used_percent}} metrics, as well as a summary in form of {{50.00% used (1.10 TB of 2.20 TB)}}.