Ci/docker compose pyyaml cython -- unit mock assertions

[briantist]

SUMMARY

CI is failing recently on local integration testing due to some dependency issues.
docker-compose depends on pyyaml<6 whose installation is broken with the newly released cython==3.

• [BUG] PyYAML<=6 dependency install issue due to Cython 3.0.0 release docker/compose#10836
• "AttributeError: cython_sources" with Cython 3.0.0a10 yaml/pyyaml#601

Until someone fixes things in a way that doesn't require a workaround, we're putting a workaround in place.

Also took this opportunity to remove six and a constraint for py2.7 since we don't support it anymore.

---

Another error has been revealed: we had several instances of assert some_mock.called_once_with(...) which is a classic error; the method name is assert_called_once_with and since the mock returns a MagicMock for all members that don't exist, the incorrect form always asserts True.

It seems that in python 3.12 this case has been caught as a probable error, and our CI is failing on these:

• Prevent prefix "called_" for methods on mock objects in safe mode python/cpython#100690

ISSUE TYPE

• CI Pull Request
• Tests Pull Request

[codecov]

Codecov Report

Merging #390 (9baadab) into main (1bf76d5) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 9baadab differs from pull request most recent head 6bf5d9f. Consider uploading reports for the commit 6bf5d9f to get more accurate results

@@           Coverage Diff           @@
##             main     #390   +/-   ##
=======================================
  Coverage   98.86%   98.86%           
=======================================
  Files          82       82           
  Lines        4235     4235           
  Branches      455      455           
=======================================
  Hits         4187     4187           
  Misses         39       39           
  Partials        9        9           

Flag	Coverage Δ
env_docker-default	98.86% <100.00%> (ø)
integration	81.31% <ø> (ø)
sanity	39.49% <ø> (ø)
target_auth_approle	89.47% <ø> (ø)
target_auth_aws_iam	50.00% <ø> (ø)
target_auth_azure	53.84% <ø> (ø)
target_auth_cert	86.36% <ø> (ø)
target_auth_jwt	91.30% <ø> (ø)
target_auth_ldap	89.47% <ø> (ø)
target_auth_none	100.00% <ø> (ø)
target_auth_token	71.42% <ø> (ø)
target_auth_userpass	85.71% <ø> (ø)
target_connection_options	74.76% <ø> (ø)
target_controller	83.93% <ø> (ø)
target_filter_vault_login_token	77.77% <ø> (ø)
target_import	39.49% <ø> (ø)
target_lookup_hashi_vault	81.33% <ø> (ø)
target_lookup_vault_ansible_settings	56.07% <ø> (ø)
target_lookup_vault_kv1_get	91.30% <ø> (ø)
target_lookup_vault_kv2_get	91.11% <ø> (ø)
target_lookup_vault_list	90.00% <ø> (ø)
target_lookup_vault_login	88.57% <ø> (ø)
target_lookup_vault_read	90.00% <ø> (ø)
target_lookup_vault_token_create	79.24% <ø> (ø)
target_lookup_vault_write	57.14% <ø> (ø)
target_module_utils	97.48% <100.00%> (ø)
target_module_vault_kv1_get	87.50% <ø> (ø)
target_module_vault_kv2_delete	56.93% <ø> (ø)
target_module_vault_kv2_get	87.23% <ø> (ø)
target_module_vault_kv2_write	57.32% <ø> (ø)
target_module_vault_list	85.71% <ø> (ø)
target_module_vault_login	83.72% <ø> (ø)
target_module_vault_pki_generate_certificate	78.72% <ø> (ø)
target_module_vault_read	85.71% <ø> (ø)
target_module_vault_token_create	91.66% <ø> (ø)
target_module_vault_write	56.25% <ø> (ø)
target_modules	82.09% <ø> (ø)
units	95.55% <100.00%> (ø)

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Impacted Files	Coverage Δ
...s/module_utils/authentication/test_auth_aws_iam.py	100.00% <100.00%> (ø)
...ins/module_utils/authentication/test_auth_azure.py	100.00% <100.00%> (ø)