now can use `ansible-test units module_name` for the aws_s3 and aws_api_gateway modules
changes to modules/cloud/amazon/aws_api_gateway and modules/cloud/amazon/aws_s3 are not triggering the unit tests; also fix aws_s3 from importing non-exist module and skipping tests
changes to module_utils/aws/core.py are only being unit tested on modules that import from the file (if they have a corresponding test) or tests that import from the file themselves.
1fdd84b88c