[Merge] ~bamf0/ubuntu-release-upgrader:ibm-prevent-z13-26-04-update into ubuntu-release-upgrader:ubuntu/main

[Simon Johnsson]

Simon Johnsson has proposed merging ~bamf0/ubuntu-release-upgrader:ibm-prevent-z13-26-04-update into ubuntu-release-upgrader:ubuntu/main.

Requested reviews:
  git-ubuntu import (git-ubuntu-import)
  Nick Rosbrook (enr0n)

For more details, see:
https://code.launchpad.net/~bamf0/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/499739

This merge request will introduce a quirk that prevents s390x systems below the z15 generation to upgrade beyond 25.10, since 26.04 LTS will introduce a requirement of z15 or higher.

Changed files:
* DistUpgrade/DistUpgradeQuirks.py - Introduce a PostInitialUpdate fail check that aborts
  upgrades on s390x generations below z15.

Added files:
* DistUpgrade/S390xGeneration.py - Ordered enum constants representing s390x generations and
  function for parsing the system's generation from /proc/cpuinfo.
* tests/test_s390x_generation.py - Unit tests for the S390xGeneration module verifying parsing
  and known machine types.

---

Local autopkgtest results on amd64:

Ran 66 tests in 5.865s

OK (SKIP=1)
autopkgtest [14:30:11]: test nose-tests: -----------------------]
autopkgtest [14:30:12]: test nose-tests:  - - - - - - - - - - results - - - - - - - - - -
nose-tests           PASS
autopkgtest [14:30:13]: @@@@@@@@@@@@@@@@@@@@ summary
nose-tests           PASS
qemu-system-x86_64: terminating on signal 15 from pid 150998 (/usr/bin/python3)
-- 
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