404 Error when loading remote data files from private repo
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I guess the issue is when computing the ETags of the remote files. Indeed `use_auth_token` must be passed to `request_etags` here:

https://github.com/huggingface/datasets/blob/35b5e4bc0cb2ed896e40f3eb2a4aa3de1cb1a6c5/src/datasets/builder.py#L160-L160
2021-07-28T15:15:02Z
https://github.com/huggingface/datasets/issues/2724#issuecomment-888394043
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2021-07-28T15:15:02Z
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MEMBER
Yes, I remember having properly implemented that: 
- https://github.com/huggingface/datasets/commit/7a9c62f7cef9ecc293f629f859d4375a6bd26dc8#diff-f933ce41f71c6c0d1ce658e27de62cbe0b45d777e9e68056dd012ac3eb9324f7R160
- https://github.com/huggingface/datasets/pull/2628/commits/6350a03b4b830339a745f7b1da46ece784ca734c

But a subsequent refactoring accidentally removed it...
2021-07-28T16:11:35Z
https://github.com/huggingface/datasets/issues/2724#issuecomment-888437065
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2021-07-29T04:58:49Z
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I have opened a PR to fix it @lewtun.
2021-07-28T16:14:11Z
https://github.com/huggingface/datasets/issues/2724#issuecomment-888438968
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## Describe the bug
When loading remote data files from a private repo, a 404 error is raised.

## Steps to reproduce the bug
```python
url = hf_hub_url("lewtun/asr-preds-test", "preds.jsonl", repo_type="dataset")
dset = load_dataset("json", data_files=url, use_auth_token=True)
# HTTPError: 404 Client Error: Not Found for url: https://huggingface.co/datasets/lewtun/asr-preds-test/resolve/main/preds.jsonl
```

## Expected results
Load dataset.

## Actual results
404 Error.

