- Bump version: 10.0.16 → 10.0.17

- Fixed box plugin documentation
The provided example was no longer correct according to
changes on the image description referenced in the example

- Add procps to Tumbleweed integration tests

- Add procps to Tumbleweed integration tests

- Fix sdist upstream tarball contents
The .virtualenv.dev-requirements.txt file is referenced by tox.ini
but not put into the sdist tarball and therefore missing in the
pypi upstream data.

- Drop use of obsolete pkg_resources
As documented in https://setuptools.pypa.io/en/latest/pkg_resources.html
the use of pkg_resources is obsolete and will cause issues.
So happened on Debian unstable. This Fixes #2548

- RepositoryDnf5: correct defaults, set system_cachedir
The "defaults" in `use_default_location` here are the dnf4
defaults, not the dnf5 defaults, so let's update them. Also, for
dnf5, we need to set `system_cachedir` instead of `cachedir` -
see https://dnf5.readthedocs.io/en/latest/misc/caching.7.html ,
`system_cachedir` is the cache location used when running as
root, `cachedir` is the cache location used when running as a
regular user.
Signed-off-by: Adam Williamson