Adds autobackup (integrated, managed VM backups with automatic remote
filesystem mounting, included backup expiry/removal and automatic
full/incremental selection, independent from the manual "pvc vm backup"
commands) to the CLI client.
This is a bit of a large command to handle only inside the CLI client,
but this was chosen as it's the only real place for it aside from an
external script.
There are several major restrictions on this command, mainly that it
must be run from the primary coordinator using the "local" connection,
and that it must be run as "root".
The command is designed to run in a cron/systemd timer installed by
pvc-ansible when the appropriate group_vars are enabled, and otherwise
not touched.
Also clean up the old versions in the postinst as they are obsolete and
not needed going forward. These only ever served as reference for a
manual installation which itself is long-obsoleted, and thus can be put
somewhere less "important".
This helps ensure an easier restore as the tar archive(s) can be sent
directly to the API via the normal process of image uploading, instead
of individual disks.
Converting into human results in imprecise values when specifying bytes
directly, which in turn breaks VMDK image uploads. Instead, just use the
raw bytes value when creating the volume instead of converting it back.
Adds a new API query parameter to define the file size, which is then
used for the temporary image. This is required for, at least VMDK, files
to work properly in qemu-img convert.
