install hook fails due to incompatible setuptools

[Kevin W Monroe]

Canal and calico rely on the 'conctl' package, which relies on click:

https://github.com/charmed-kubernetes/conctl/blob/master/setup.py#L14

The 'click' package was upgraded to 8.x in the last couple weeks:

https://pypi.org/project/click/#history

Among other things, this brings in 'importlib-metadata', which relies on 'setuptools>=42':

https://github.com/python/importlib_metadata/commit/0bf3d43d97d5466fddac708e7ca38ba95281c6e7

This is incompatible with the pin from `layer-basic`:

https://github.com/juju-solutions/layer-basic/commit/6d2d4fcad3def1511d1a39339326885e270c0772

This results in an install hook failure like this:
2021-05-26 22:00:21 DEBUG install Installing build dependencies: started
2021-05-26 22:00:23 WARNING install ERROR: Command errored out with exit status 1:
2021-05-26 22:00:23 WARNING install command: /var/lib/juju/agents/unit-canal-4/.venv/bin/python /var/lib/juju/agents/unit-canal-4/.venv/lib/python3.8/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-cxeeiml8/overlay --no-warn-script-location --no-binary :none: --only-binary :none: --no-index --find-links wheelhouse -- 'setuptools>=42' wheel 'setuptools_scm[toml]>=3.4.1'
2021-05-26 22:00:23 WARNING install cwd: None
2021-05-26 22:00:23 WARNING install Complete output (3 lines):
2021-05-26 22:00:23 WARNING install Looking in links: wheelhouse
2021-05-26 22:00:23 WARNING install ERROR: Could not find a version that satisfies the requirement setuptools>=42 (from versions: 41.6.0)
2021-05-26 22:00:23 WARNING install ERROR: No matching distribution found for setuptools>=42

We need to set a 'click<8.0' pin in both canal and calico to keep 'setuptools' at a usable rev.

[Kevin W Monroe (kwmonroe)]

Reviewed PRs:

https://github.com/charmed-kubernetes/layer-canal/pull/62
https://github.com/charmed-kubernetes/layer-calico/pull/69
https://github.com/charmed-kubernetes/layer-tigera-secure-ee/pull/34

[Kevin W Monroe (kwmonroe)]

Cherry picks to stable:

https://github.com/charmed-kubernetes/layer-canal/commit/4e23e33e4d95f9c3d2f7eeae33e5db03c365e998

https://github.com/charmed-kubernetes/layer-calico/commit/63c6d240f29b0366c3839dacd4e25d63a368da36

https://github.com/charmed-kubernetes/layer-tigera-secure-ee/commit/099758aa4b9b80c4bd5961a34fb29ef9d1a73784

[Cory Johns (johnsca)]

This was released on May 28th with canal rev 799, calico rev 799, and tigera-secure-ee rev 194.