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In #777, we added 'vendordata2' and 'vendordata2_raw' attributes to
the DataSource class, but didn't use the upgrade framework to deal
with an unpickle after upgrade. This commit adds the necessary
upgrade code.
Additionally, added a smaller-scope upgrade test to our integration
tests that will be run on every CI run so we catch these issues
immediately in the future.
LP: #1922739
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On the datasource class, we require the use of paths.run_dir to
perform some operations. On older cloud-init version, the
Paths class does not have the run_dir attribute. To fix that,
we are now manually adding that attribute in the Paths
object if doesn't exist in the unpickle operation.
LP: #1899299
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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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