[service-announce] Dropping support for Ansible 2.x in our Zuul

[Jeremy Stanley]

Following the earlier 2.8/2.9 deprecation in June and change of our
default to Ansible 5 in July, we will soon be restarting onto a
version of Zuul which no longer supports 2.x versions at all. While
we've looked for any lingering overrides to old Ansible versions in
master branch jobs and given projects a heads up individually, we
lack insight into whether the same may be occurring on non-default
branches of projects.

If you are aware of any jobs on any of your branches which pin back
to an earlier Ansible version, we strongly recommend you remove
those overrides at your earliest opportunity, otherwise those jobs
will break in the coming days.

Here is the change to remove support for Ansible 2.8 and 2.9 in Zuul
(we generally restart our Zuul services every weekend, so that's
when it's most likely to take effect):

https://review.opendev.org/857796

For some example changes which clean up old Ansible version
overrides, see this review topic list:

https://review.opendev.org/q/topic:cleanup-old-ansible

-- 
Jeremy Stanley
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