Running Keystone Unit Tests against older Versions of RDO Etc

Just because upstrem is no longer supporting Essix doesn’t mean that someone out there is not running it. So, if you need to back port a patch, you might find yourself in the position of having to run unit tests against an older version of Keystone (or other) that does not run cleanly against the files installed by tox. For example, I tried running against an Icehouse era checkout and got a slew of errors like this:
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