[bigquery] snippets.py list-datasets is buggy #1772

In which file did you encounter the issue?

python-docs-samples/bigquery/cloud-client/snippets.py

Did you change the file? If so, how?

No

Describe the issue

python snippets.py --project 'my-project' list-datasets"

usage: bigquery_setup.py list-datasets [-h] dataset_id
bigquery_setup.py list-datasets: error: too few arguments

There was a fault in the create_dataset_parser which overrode the list_datasets_parser .

I claim to fix it