Delta lake fails to import (in Python)
Delta lake file import was added to H2O (https://h2oai.atlassian.net/browse/PUBDEV-7923), but it fails for Python API
key is to disable the workaround in Python and it will start working:
```H2OFrame._LOCAL_EXPANSION_ON_SINGLE_IMPORT_ = False```
The error show the crc and json paths but converted all the forward slashes and colon to underscore:"dbfs:/mnt/delta/events3/_delta_log/00000000000000000000.crc" ->
It doesn’t work when a slash is inserted at the end of the directory name (eg. by user or by python - hence the workaround). The regular expression that filters out the log files needs to be revised in order to work with/without slash.