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Hi Thierry,

> Indeed. The whole idea behind a single release channel for python client
> libraries was that you should always be running the latest, as they
> should drastically enforce backward compatibility.

Well, backward compatibility can be tricky when it comes to test.
We've for example recently had an issue where the newer keystoneclient
broke mocking in tests. It is debateable if tests are part of the
backward compatibility or not.

See for example https://bugs.launchpad.net/horizon/+bug/1196823

This is currently also preventing me from being able to get a change
on stable/grizzly past gating checks (which stumble on exactly this
"regression").

Greetings,
Dirk