loongson/pypi: links for streamsx-testing

loongson/mirror streamsx.testing-0.3.1.tar.gz
loongson/mirror streamsx.testing-0.3.1-py2.py3-none-any.whl
loongson/mirror streamsx.testing-0.3.0.tar.gz
loongson/mirror streamsx.testing-0.3.0-py2.py3-none-any.whl
loongson/mirror streamsx.testing-0.2.2.tar.gz
loongson/mirror streamsx.testing-0.2.2-py2.py3-none-any.whl