grenade jobs with tempest plugins tests on stable/train is broken

[Ghanshyam Mann]

grenade py2.7 jobs in stable/train are failing due to Tempest venv constraint mismatch which end up RE-creating the Tempest venv remove the already installed tempest plugins and its deps.

- https://zuul.opendev.org/t/openstack/build/9b7a7658f1744f6085393e56ac151052/log/logs/grenade.sh.txt#42858

recreation of tempest venv is happening because Tempest is pinned for 26.0.0 for stable/stein (which is what devstack old is for stable/train grenade jobs) and tempest venv constraints also pinned accordingly

- https://github.com/openstack/devstack/blob/b684597ec7939b4b9a469807a94988d79f2f1f5a/stackrc#L319-L320

But grenade script or any other script running the Tempest tests via tox env use the default constraints in tox.ini. And both constraints differ (1. TEMPEST_VENV_UPPER_CONSTRAINTS which is pinned at devstack side 2. tox.ini one) which cause the tempest vnenv -creation.

We need to set the same constraints as TEMPEST_VENV_UPPER_CONSTRAINTS in grenade or other test running scripts too.

[Ghanshyam Mann (ghanshyammann)]

This impact heat grenade jobs also

[Martin Kopec (mkopec)]

https://review.opendev.org/q/topic:%2522standardize-tempest-tox-constraints%2522+(status:open+OR+status:merged)+project:openstack/grenade

[Ghanshyam Mann (ghanshyammann)]

fixed by https://review.opendev.org/q/I66b5d128c3dbe51289410760ea1cbf7f61c55c2f

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/heat train-eol release.