Implement upgrade testing for os_cinder role. This patch adds an upgrade testenv, which configures a previous version of Cinder, and the test-vars from the previous stable branch to be used by the previous version of Cinder. We don't run functional tests after the initial stable/newton deploy because a working stable/newton branch is already tested, and it's assumed it worked if the upgrade works too - which is more efficient. This follows the pattern setup for Keystone in: https://review.openstack.org/#/c/384269/ Change-Id: I674fe8cefac6f487c766d51f874f1b43468cdaaa Implements: blueprint upgrade-testing
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