kt vm: use different qcow images

[roxanan1996]

https://ciqinc.atlassian.net/browse/KERNEL-904

1. Instead of reusing the same base image for all 9.x (latest 9.7 at the moment) or 8.x kernels (latest 8.10 at the moment), we now use the matching qcow images that take into account the minor version as well.
   Url used
   https://dl.rockylinux.org/vault/rocky/9.2/images/x86_64/Rocky-9-GenericCloud.latest.x86_64.qcow2

2. Added --override-base that will delete the qcow base and download it again. After the vm is deleted of course. Then the vm is setup and instantiated from a fresh base.

3. While at it, fixed a typo in some command helpers.

Test

[rnicolescu@localhost lts-9.6]$ uname -r
5.14.0-570.17.1.el9_6.x86_64

[rnicolescu@localhost lts-9.4]$ uname -r
5.14.0-427.18.1.el9_4.x86_64

[rnicolescu@localhost lts-9.2]$ uname -r
5.14.0-284.11.1.el9_2.x86_64

[rnicolescu@localhost lts-8.6]$ uname -r
4.18.0-372.13.1.el8_6.x86_64

Base images

$ ~/ciq/default_test_images
$ ll
total 4.6G
-rw-r--r--. 1 rnicolescu rnicolescu 2.5G May 22 12:36 Rocky-8.6-GenericCloud.latest.x86_64.qcow2
-rw-r--r--. 1 rnicolescu rnicolescu 944M May 22 12:31 Rocky-9.2-GenericCloud.latest.x86_64.qcow2
-rw-r--r--. 1 rnicolescu rnicolescu 576M May 22 12:27 Rocky-9.4-GenericCloud.latest.x86_64.qcow2
-rw-r--r--. 1 rnicolescu rnicolescu 599M May 22 12:21 Rocky-9.6-GenericCloud.latest.x86_64.qcow2

Test for --override-base

❯ kt vm lts-9.6 -c --override-base
INFO:Running command ['virsh', '--connect', 'qemu:///system', 'dominfo', 'lts-9.6']
INFO:Running command ['virsh', '--connect', 'qemu:///system', 'destroy', 'lts-9.6']
INFO:Running command ['virsh', '--connect', 'qemu:///system', 'dominfo', 'lts-9.6']
INFO:Running command ['virsh', '--connect', 'qemu:///system', 'undefine', 'lts-9.6']
INFO:Downloading image from https://dl.rockylinux.org/vault/rocky/9.6/images/x86_64/Rocky-9-GenericCloud.latest.x86_64.qcow2
 91% [################################################################      ]           550M / 598M

Proof the base is downloaded again.

[Copilot]

Pull request overview

This PR updates kt vm to select Rocky Linux QCOW2 base images by major.minor (e.g., 9.2 vs 9.4) instead of only major version, and adds a CLI option to force re-downloading the base image.

Changes:

• Choose base image names/paths using the kernel’s extracted major.minor version.
• Add --override-base to delete and re-download the shared base QCOW2 before VM creation.
• Update Rocky download URL base and documentation/examples to reflect the new image naming.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
kt/ktlib/vm.py	Adds vm_major_minor_version, uses it for base image selection, and implements base image override re-download logic.
kt/ktlib/util.py	Updates Rocky base URL and QCOW2 filename suffix constants used for image downloads.
kt/KT.md	Updates the documented base QCOW2 filename example to include major.minor.
kt/commands/vm/impl.py	Threads the new override_base flag through the VM command implementation.
kt/commands/vm/command.py	Adds the --override-base Click option and documents its behavior in the CLI help text.

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