Container-inspector

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This is a major release with an API change.

- ``container_inspector.distro.parse_os_release`` and its tests have been moved
to ``commoncode.distro.parse_os_release``. container-inspector has been
updated to use ``commoncode.distro.parse_os_release``.

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This is a minor release with bug fixes.

- We now correctly process the opaque whiteouts seen in container image layers
tarballs.

Thank you to AJ Arena sig-aarena

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This is a minor release with bug fixes and an output change.

- We no longer support Python 3.6, only 3.7 and up.

- "utils.extract_tar" function now behaves correctly with links and return
either a list of error message strings (the previous default) but with updated
messages or a list of ExtractEvent to better track extraction errors and warnings.
The behavious is driven by the "as_events" argument.

- In all places where extract is callable (Image, Layer) there is a new
"skip_symlinks" argument defaulting to True. If True, we skip symlinks and links.
The same applies with the "as_events" available in these places as these
functions now return a list (rather than nothing before).

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This is a minor release with minor updates.

- ``utils.extract_tar`` now returns a list of error messages that occured during
extraction.
- Add tests for ``utils.extract_tar``

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This is a major release with bug fixes and API changes.

- Remove dependency on extractcode as images only need basic tar to extract.
- "utils.extract_tar" function now accepts a skip_symlink argument
- Adopt the latest skeleton.
- Add new os-release tests

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This is a minor release with bug fixes and minor updates.

- Switched back to semver from calver like other AboutCode projects.
- Adopted the latest skeleton. With this the virtualenv is created under venv.
- Add new "layer_path_segments" argument to image.Image.to_dict() to allow
to report the Layer extracted locations as trimmed paths keeping only this
many trailing path segments.