* Implement find_spec and exec_module to remove reliance on deprecated methods in the collection loader
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* Move module execution to exec_module
Remove extra sys.modules handling
Use default module initialization by returning None from loader.create_module
Refactor
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* Remove ansible-test's copy of the collection loader
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* Fix metaclass for Python 2.x
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* Fix Py2/Py3 syntax compatibility
* Refactor
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* update collection_loader comments
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* simplify find_module
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* Fix Py2 compatibility - don't get loader from nonexistent spec
Remove unnecessary PY3 checking
* Refactor common code in load_module and exec_module
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* tidy diff
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* Include collection_loader in target paths for 'compile' sanity test
* add changelog
* Add "return None" instead of doing it implicitly
Remove get_filename
short-circuit exec_module if it's a redirect
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* Add script to freeze sanity requirements.
* Declare sanity test requirements and freeze
* Use pinned requirements for import.plugin test.
* Expand scope of import test for ansible-core.
* Add ignores for galaxy import errors.
* Update test-constraints sanity test.
* Overhaul ansible-test integration tests.
* ansible-test - Fix import test pyyaml usage.
* ansible-test - Remove unused import.
* ansible-test - Fix traceback when pip is unavailable.
* ansible-test - Fix typo in port forwarding message.
* ansible-test - Fix controller logic in requirements install.
* Fix unit tests in ansible-test integration test.
Unit tests are now run for available Python versions which
provide `virtualenv` (Python 2.x) or `venv` (Python 3.x).
* ansible-test - Create injector scripts at runtime.
* Set bootstrap.sh shebang at runtime.
* Remove shebang and execute bit from importer.
* Update shebang sanity test.
* Preserve line numbers.
* ansible-test - Fix use of abstractproperty
* ansible-test - Use dict.items() where possible.
* ansible-test - Remove unused code.
* ansible-test - Cleanup issues reported by pylint.
* ansible-test - Use dict.items() where possible.
* ansible-test - Use generator.
Matt Clay