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This commit does the following:
* introduces the `cloudinit.persistence` module, containing
`CloudInitPickleMixin` which provides lightweight versioning of
objects' pickled representations (and associated testing)
* introduces a basic upgrade testing framework (in
`cloudinit.tests.test_upgrade`) which unpickles pickles from previous
versions of cloud-init (stored in `tests/data/old_pickles`) and tests
invariants that the current cloud-init codebase expects
* uses the versioning framework to address an upgrade issue where
`Distro.networking` could get into an unexpected state, and uses the
upgrade testing framework to confirm that the issue is addressed
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