cloud-init: uprev to 22.2

Minor fixes to distro patch:

- formatting, etc. to comply with upstream linting

- add .py extension to tests/unittests/distros/test_mariner

- fixup broken imports for test_mariner module

Cloud-init 22.2 includes several fixes/improvements for Azure's
datasource, full changelog is here:
https://github.com/canonical/cloud-init/blob/22.2/ChangeLog

Signed-off-by: Chris Patterson <[email protected]>