Add a release note prelude for the Yoga release.

Change-Id: Id601999762596713c94e7805a7d76dbcf31edf24

A new reimage API will be introduced on cinder API side with
change in depends on. This patch provides the CLI support for
the same by adding a reimage command.

Implements: blueprint add-volume-re-image-api

Change-Id: I37c254d4caf2f416e456ff6a78b5a4df4e08a176

We don't need to track this in test-reqs for
unit tests, etc. since it's only used for
functional tests.

Change-Id: I2e9a55d0f4530e9f3fd0f6c1c48cf5ee19c841da

Python 2 support was removed during Ussuri cycle. This change adds
the classifier to clearly state that only Python 3 is supported.

This allows us to keep the setup.cfg file in cinder and the one in
cinderclient more consistent.

Change-Id: I5ad342f2b60348a0ba79c95415fdf1ae39714558

Yoga testing runtime[1] has been updated to add py39
testing as voting and as we are testing py3.6 and py3.9
we do not need to test py3.7|8 explicitly. Unit tests update are
handled by the job template change in openstack-zuul-job

- https://review.opendev.org/c/openstack/openstack-zuul-jobs/+/820286

this commit makes other required changes in zuul.yaml and
update the classifier in setup.cfg file.

[1] https://governance.openstack.org/tc/reference/runtimes/yoga.html

Change-Id: Ib5b93ca7863fcc0b6d00fb4d52a5f299d1903056

This patch adds information about whichever default type is set for
API will be used during volume creation if we don't provide a
volume type in volume create command.
This patch also improves the help text of `cinder type-default` command.

Change-Id: I0c437b2c4f02c12d17c04719cbeff8521647ae15