[SW-1605] Gradle reported success even though the python test failed (#1516)
[SW-1605] Gradle reported success even though the python test failed (#1516)


(cherry picked from commit cda9fd845f8723c5c26cfba8d613a6619310f19f)

h2oai/sparkling-water,h2oai/sparkling-water,h2oai/sparkling-water,h2oai/sparkling-water