live migration jobs failing missing lxml

[Dan Smith]

Our jobs that run the evacuate post hook are failing due to not being able to run the ansible virt module because of a missing lxml library:

2023-10-16 14:38:57.818847 | TASK [run-evacuate-hook : Register running domains on subnode]
2023-10-16 14:38:58.598524 | controller -> 172.99.67.184 | ERROR
2023-10-16 14:38:58.598912 | controller -> 172.99.67.184 | {
2023-10-16 14:38:58.598981 | controller -> 172.99.67.184 | "msg": "The `lxml` module is not importable. Check the requirements."
2023-10-16 14:38:58.599046 | controller -> 172.99.67.184 | }

Not sure why this is coming up now, but it's likely related to the recent switch to global venv for our services and some other dep change that no longer gets us this on the host for free.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/nova/+/898435

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/nova/+/898439

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/nova/+/898435
Committed: https://opendev.org/openstack/nova/commit/bfdc99ffbbe4f67f6e2f04025a5634dd9b11dee0
Submitter: "Zuul (22348)"
Branch: master

commit bfdc99ffbbe4f67f6e2f04025a5634dd9b11dee0
Author: Dan Smith <email address hidden>
Date: Mon Oct 16 08:32:56 2023 -0700

    Install lxml before we need it in post-run

    Change-Id: Ibf6bfde6c524821fa5dc3c01b2eb57635e587de6
    Closes-Bug: #2039463

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/2023.2
Review: https://review.opendev.org/c/openstack/nova/+/899142

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/nova/+/899142
Committed: https://opendev.org/openstack/nova/commit/6d5943e1b5f748fbe3c5faa8c3e33eac83b7e166
Submitter: "Zuul (22348)"
Branch: stable/2023.2

commit 6d5943e1b5f748fbe3c5faa8c3e33eac83b7e166
Author: Dan Smith <email address hidden>
Date: Mon Oct 16 08:32:56 2023 -0700

    Install lxml before we need it in post-run

    Change-Id: Ibf6bfde6c524821fa5dc3c01b2eb57635e587de6
    Closes-Bug: #2039463
    (cherry picked from commit bfdc99ffbbe4f67f6e2f04025a5634dd9b11dee0)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 28.0.1 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 29.0.0.0rc1 release candidate.