ensure all tests pass in `auto_disc`

[jesseylin]

minimum prerequisite before moving to automated testing

to wit:

FAILED auto_disc/utils/callbacks/on_discovery_callbacks/tests/test_save_discovery_in_expedb.py::test___call__ - requests.exceptions.ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=5001): ...
FAILED utils/filetype_converter/tests/test_filetype_converter.py::test_convert_video - OSError: Could not find a backend to open `<bytes>`` with iomode `r`.
FAILED utils/leaf/tests/test_leaf.py::test_leaf_deserialize - AssertionError: assert 'auto_disc.ut...telessLocator' == 'leaf.locator...telessLocator'
FAILED utils/leaf/tests/test_recursive_leaf.py::test_pipeline___init__ - AssertionError: assert '' is {}
FAILED utils/leaf/tests/test_recursive_leaf.py::test_pipeline_save_data - AssertionError: assert 1 == 3
FAILED utils/leaf/tests/test_recursive_leaf.py::test_mixed_save_leaf - FileNotFoundError: [Errno 2] No such file or directory: '/Users/jesselin/src/inria/adt...
FAILED utils/leaf/tests/test_recursive_leaf.py::test_container___init__ - AssertionError: a
ssert '' == {}
FAILED utils/leafutils/leafintegrations/tests/test_expedb_locators.py::test_ExpeDBLocator__
initialize_checkpoint - requests.exceptions.ConnectionError: HTTPConnectionPool(host='127.0
.0.1', port=5001): ...
FAILED utils/leafutils/leafintegrations/tests/test_expedb_locators.py::test_ExpeDBLocator__
retrieve_mongo_id - requests.exceptions.ConnectionError: HTTPConnectionPool(host='127.0.0.1
', port=5001): ...
FAILED utils/leafutils/leafintegrations/tests/test_expedb_locators.py::test_ExpeDBLocator_s
tore - requests.exceptions.ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=5001)
: ...
FAILED utils/leafutils/leafintegrations/tests/test_expedb_locators.py::test_ExpeDBLocator_r
etrieve - requests.exceptions.ConnectionError: HTTPConnectionPool(host='127.0.0.1', port=50
01): ...
FAILED utils/leafutils/leafintegrations/tests/test_expedb_locators.py::test_ExpeDBLinearLoc
ator__retrieve_tree_and_store_metadata - requests.exceptions.ConnectionError: HTTPConnectio
nPool(host='127.0.0.1', port=5001): ...
FAILED utils/leafutils/leafintegrations/tests/test_expedb_locators.py::test_ExpeDBLinearLoc
ator_store - IndexError: list index out of range
FAILED utils/leafutils/leafintegrations/tests/test_expedb_locators.py::test_ExpeDBLinearLoc
ator_retrieve - requests.exceptions.ConnectionError: HTTPConnectionPool(host='127.0.0.1', p
ort=5001): ...