Add: support for live ISOs to zapper_kvm connector

[p-gentili]

Pending review of the Zapper counterpart.

Description

This PR updates the zapper_kvm connector with support for provisioning a live ISO. Two new arguments make that possible:

1. boot_from_ext_media: which should be true, so that the USB stick is kept connected to the DUT side
2. wait_until_ssh: which defaults to true, but it might me useful if the live ISO does not have a SSH server available at boot

Resolved issues

Part of ZAP-840

Documentation

Updated adding a section for the "live ISO" specific parameters

Web service API changes

N/A

Tests

Tested with Zapper by running the corresponding API. An example job using TF would be:

job_queue: 202207-30464
global_timeout: 18000
output_timeout: 1800

provision_data:
  url: https://releases.ubuntu.com/noble/ubuntu-24.04-desktop-amd64.iso
  robot_tasks:
    - hp/pro/sff_400_g9/boot/boot_from_usb.robot
    - common/grub/stop/stop_at_grub.robot
  boot_from_ext_media: true
  wait_until_ssh: false
  skip_download: true  # USB stick already flashed for testing

[plars]

Just a few questions.

[plars]

The changes you made to the documentation make the "boot_from_ext_media" much more clear. Also, I can see some value in keeping it the same as how it's defined in the zapper source. I think calling it "live_iso" or "live_image" makes it a bit more intuitive, but if you want to keep it the way it is for consistency, I'm fine with that.

[plars]

+1