Ignore pylint warnings for construct that does not work with Python 2 (…

…#821)

* Ignore pylint warnings for construct that does not work with Python 2.

* Revert "Ignore pylint warnings for construct that does not work with Python 2."

This reverts commit 92c19c7.

* Different approach: use ignore.txt since otherwise ansible-core 2.14 tests fail.

tests/sanity/ignore-2.17.txt

@@ -1 +1,4 @@
 plugins/modules/docker_container_copy_into.py validate-modules:undocumented-parameter # _max_file_size_for_diff is used by the action plugin
+plugins/module_utils/_api/api/client.py pylint:use-yield-from  # suggested construct does not work with Python 2
+plugins/module_utils/_api/utils/build.py pylint:use-yield-from  # suggested construct does not work with Python 2
+tests/unit/plugins/module_utils/test_copy.py pylint:use-yield-from  # suggested construct does not work with Python 2