reworked unit test for deleteFolder
reworked unit test for deleteFolder

SpectraLogic/ds3_python_sdk,SpectraLogic/ds3_python_sdk,SpectraLogic/ds3_python_sdk,chanchett/ds3_python_sdk_,chanchett/ds3_python_sdk,chanchett/ds3_python_sdk,chanchett/ds3_python_sdk