client lib integration tests should hit multiple branches

[James E. Blair]

find a way to run the devstack integration test of python-novaclient (and others) against all interesting branches (master, stable/diablo, etc.).

[Joe Gordon (jogo)]

This is based on the requirement that python-*clients should work across supported releases.

We have some basic client lib tests (well CLI tests, in tempest actually). And we want to make sure that trunk python-*clients work against all supported openstack versions.

One way to do this is to test each proposed client patch against stable/* devstack + trunk tempest CLI tests. But this may cause some issues as we add new tests (for extensions that didn't exist in old releases), so instead I think we should test each proposed client against stable/* devstack plus stable/* tempest.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/41931

[Monty Taylor (mordred)]

This is still blocked on https://review.openstack.org/#/c/41945/

[Clark Boylan (cboylan)]

https://review.openstack.org/#/c/41945/ has merged. Next step is adding jobs to test the clients against older branches of server projects.

[Clark Boylan (cboylan)]

We are now running master python-*client against previous supported releases of the master software. This is implemented as the stable-compat-jobs project template in zuul's layout.yaml. Any project with that project template in it is tested in this way.