add versions command to proxmox-backup-manager

Add the versions command to proxmox-backup-manager with a similar output
to pveversion [-v]. It prints the packages line by line with only the
package name, followed by the version and, for proxmox-backup and
proxmox-backup-server, some additional information (running kernel,
running version).

In addition it supports the optional output-format parameter which can
be used to print the complete data in either json, json-pretty or text
format. If output-format is specified, the --verbose parameter is
ignored and the detailed list of packages is printed.

With the addition of the versions command, the report is extended as
well.

Signed-off-by: Mira Limbeck <m.limbeck@proxmox.com>

src/server/report.rs

@@ -20,6 +20,7 @@ fn files() -> Vec<&'static str> {
 fn commands() -> Vec<(&'static str, Vec<&'static str>)> {
     vec![
     //  ("<command>", vec![<arg [, arg]>])
+        ("proxmox-backup-manager", vec!["versions", "--verbose"]),
         ("df", vec!["-h"]),
         ("lsblk", vec!["--ascii"]),
         ("zpool", vec!["status"]),