Refactor handling of kernel information

[MichalHe]

Refactor the handling of kernel-related information away from using distributed ad-hoc logic based only on kernel release in IPUConfiguration. Instead, introduce the KernelInfo message providing rich information about the booted kernel. These changes also affect the information about the target kernel which previously only included target kernel's nevra that was misleadingly marked as 'version'. The new target kernel info message also contains paths to frequently used files such as the kernel image path and initramfs location. All old functionality has been kept in place, but deprecated.

Deprecated:

• leapp.libraries.common.config.version.is_rhel_realtime (check type in msg KernelInfo, field type)
• leapp.models.InstalledTargetKernelVersion (replaced by InstalledTargetKernelInfo)

Jira ref: OAMG-9452

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[MichalHe]

I've done testing of this patch on 7>8, 7>8 RealTime, 8>9.3, 8>9.3 RealTime, all upgrades passed with out issues.
Here are examples of the messages produced during the (previously) problematic 8>9.3 RealTime upgrade.

[root@localhost ~]# ./leapp-inspector messages --type KernelInfo
######################################################################
                          PRODUCED MESSAGES
######################################################################
Stamp: 2023-08-15T16:20:09.149111Z
Actor: scan_source_kernel
Phase: FactsCollection
Type: KernelInfo
Message_data:
{
    "pkg": {
        "arch": "x86_64",
        "epoch": "0",
        "module": null,
        "name": "kernel-rt-core",
        "packager": "Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>",
        "pgpsig": "RSA/SHA256, Wed 17 May 2023 12:43:11 PM UTC, Key ID 199e2f91fd431d51",
        "release": "477.11.1.rt7.275.el8_8",
        "repository": "rhel-8-for-x86_64-realtime-rpms",
        "stream": null,
        "version": "4.18.0"
    },
    "type": "realtime",
    "uname_r": "4.18.0-477.11.1.rt7.275.el8_8.x86_64"
}
######################################################################
[root@localhost ~]# ./leapp-inspector messages --type InstalledTargetKernelInfo
######################################################################
                          PRODUCED MESSAGES
######################################################################
Stamp: 2023-08-15T16:45:09.071600Z
Actor: scan_installed_target_kernel_version
Phase: RPMUpgrade
Type: InstalledTargetKernelInfo
Message_data:
{
    "initramfs_path": "/boot/initramfs-5.14.0-354.el9.x86_64+rt.img",
    "kernel_img_path": "/boot/vmlinuz-5.14.0-354.el9.x86_64+rt",
    "pkg_nevra": "kernel-rt-core-5.14.0-354.el9.x86_64"
}
######################################################################

[MichalHe]

/packit build

[pirat89]

The overall approach is good. Just some small nitpicks. Most likely we will need to do some changes in future, but right now it's ok and it's very close to resolve our future problems too. I will get to the testing tomorrow

[pirat89]

lgtm and works as expected! Kudos \o/
tested:

• rhel rt 7.9 -> 8.9
• rhel rt 8.9 -> 9.3
• rhel rt 8.8 -> 9.2
• rhel 8.9 -> 9.3

I will update the commit msg using the squash to include the list of deprecated leapp entities. The upstream documentation is going to be updated in oamg/leapp#841