[segmentation.tests] Add more tests

helpers/extract_hdf5_images.py

...dnet/libs/classification/tests/test_cli_classification.py

src/mednet/libs/segmentation/scripts/cli.py

src/mednet/libs/segmentation/scripts/evaluate.py

src/mednet/libs/segmentation/tests/test_cli_segmentation.py

src/mednet/libs/segmentation/tests/test_measures.py