salt-minion: The 'contextvars' distribution was not found and is required by salt

[James Howe]

Even though contextvars is now part of Python 3.7+, the Salt python project retains a requirement on it in order to communicate via salt-ssh with older systems.

For downstream packagers, they need to either patch out the requirement, or include the superfluous package.

[ERROR ] Failed to import module pip, this is due most likely to a syntax error:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/salt/loader/lazy.py", line 766, in _load_module
    mod = self.run(spec.loader.load_module)
  File "/usr/lib/python3/dist-packages/salt/loader/lazy.py", line 1201, in run
    return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/salt/loader/lazy.py", line 1216, in _run_as
    return _func_or_method(*args, **kwargs)
  File "<frozen importlib._bootstrap_external>", line 548, in _check_name_wrapper
  File "<frozen importlib._bootstrap_external>", line 1063, in load_module
  File "<frozen importlib._bootstrap_external>", line 888, in load_module
  File "<frozen importlib._bootstrap>", line 290, in _load_module_shim
  File "<frozen importlib._bootstrap>", line 719, in _load
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/usr/lib/python3/dist-packages/salt/modules/pip.py", line 87, in <module>
    import pkg_resources # pylint: disable=3rd-party-module-not-gated
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3267, in <module>
    def _initialize_master_working_set():
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3241, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3279, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 573, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 891, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 777, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'contextvars' distribution was not found and is required by salt

See also:
https://github.com/saltstack/salt/issues/64493
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272027

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: salt-minion 3004.1+dfsg-2
ProcVersionSignature: Ubuntu 5.15.0-83.92-generic 5.15.116
Uname: Linux 5.15.0-83-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
Date: Thu Sep 14 12:55:48 2023
PackageArchitecture: all
SourcePackage: salt
UpgradeStatus: Upgraded to jammy on 2023-09-12 (1 days ago)