Bump MAX_VERSION to 3.70 to support the following:
- 3.69 - Allow null value for shared_targets
- 3.70 - Support encrypted volume transfers

Implements: bp/transfer-encrypted-volume
Depends-On: I459f06504e90025c9c0b539981d3d56a2a9394c7
Change-Id: I11072d6d8a185037c7f4cdd52c45933b0cccaf05

Commit 3502a5591a654ae57741c6738994ffa9d8457696 broke extension loading
from pythonpath. Incompatible on python3.6.8, python3.8, python3.9. Put
it back.

Closes-Bug: #1980184
Change-Id: I5b67c93e3c789252d9bd35ee69dddbe1b556dec4

In Zed cycle, we have dropped the python 3.6/3.7[1] testing
and its support. Moving the py36 job to py38 based but to run on
ubuntu focal as c8s does not seems to have py38.
Also updating the python classifier also to reflect the same.

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

Change-Id: Ic26a360d2bb09fa6622d1acaa5021c5afbc70240

Add file to the reno documentation build to show release notes for
stable/yoga.

Use pbr instruction to increment the minor version number
automatically so that master versions are higher than the versions on
stable/yoga.

Sem-Ver: feature
Change-Id: I96aa28bd09724d3f14935e1dbf13f7e791261ccb

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