Checkmk Werk 12716: agent_proxmox_ve: Support new backup log format

ID: 12716 Title: agent_proxmox_ve: Support new backup log format Component: Checks & agents Level: 1 Class: New feature Version: 2.1.0i1 A backup log line of form "^INFO: (.*): had to backup (.*) of (.*) \(compressed (.*)\) in (.*)s" had not been recognized yet which leaded to missing keys in the backup info. This change adds support for this format.