"Memory leak" in s3 real storage tests

[phoebusm]

ArcticDB/python/tests/util/storage_test.py

Line 172 in c0a350e

def cleanup_libraries(ac):

It assumes all libraries created by the S3 real storage tests have name starts with "test_", which is wrong in some cases, e.g.:

ArcticDB/python/tests/integration/arcticdb/test_arctic_library_management.py

Line 400 in c0a350e

assert ac_mercury.list_libraries() == ["pytest_test_lib", "pytest_test_lib_2"]