CircleCI stores cleaner output at test_outputs.txt
Changes:

- Don't run pytest with `-v` or `--cov`. I left run_tests_torch_and_tf using `--cov` but would love to delete that. I have never used circleci to determine code coverage.

- the run* jobs create artifact files called test_output.txt that are easier to read than scrolling in the circleci gui

- self scheduled runner also attempts to make a test_output.txt

Before:
![image](https://user-images.githubusercontent.com/6045025/85790787-d33a8e80-b6fe-11ea-9e10-d4c48dfe713f.png)


After:

[artifact](https://53278-155220641-gh.circle-artifacts.com/0/test_output.txt) is very manageable

and [ui](https://app.circleci.com/pipelines/github/huggingface/transformers/8144/workflows/816b1f60-bda9-4456-9f51-92d6cff7b266/jobs/53278/steps) is less noisy.


# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/5291?src=pr&el=h1) Report
> Merging [#5291](https://codecov.io/gh/huggingface/transformers/pull/5291?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/79a82cc06aaa68088639bf9bb000752cfd33a8c6&el=desc) will **decrease** coverage by `1.39%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/5291/graphs/tree.svg?width=650&height=150&src=pr&token=9qOlN6Hb1c)](https://codecov.io/gh/huggingface/transformers/pull/5291?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #5291      +/-   ##
==========================================
- Coverage   79.29%   77.90%   -1.40%     
==========================================
  Files         138      138              
  Lines       24282    24282              
==========================================
- Hits        19254    18916     -338     
- Misses       5028     5366     +338     
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/5291?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/modeling\_tf\_openai.py](https://codecov.io/gh/huggingface/transformers/pull/5291/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9vcGVuYWkucHk=) | `20.78% <0.00%> (-74.20%)` | :arrow_down: |
| [src/transformers/modeling\_tf\_distilbert.py](https://codecov.io/gh/huggingface/transformers/pull/5291/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9kaXN0aWxiZXJ0LnB5) | `66.25% <0.00%> (-32.52%)` | :arrow_down: |
| [src/transformers/trainer.py](https://codecov.io/gh/huggingface/transformers/pull/5291/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy90cmFpbmVyLnB5) | `39.38% <0.00%> (-0.24%)` | :arrow_down: |
| [src/transformers/modeling\_tf\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/5291/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl91dGlscy5weQ==) | `87.48% <0.00%> (-0.15%)` | :arrow_down: |
| [src/transformers/file\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/5291/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9maWxlX3V0aWxzLnB5) | `79.59% <0.00%> (+0.33%)` | :arrow_up: |
| [src/transformers/modeling\_tf\_pytorch\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/5291/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9weXRvcmNoX3V0aWxzLnB5) | `89.30% <0.00%> (+1.25%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/huggingface/transformers/pull/5291?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/huggingface/transformers/pull/5291?src=pr&el=footer). Last update [79a82cc...73e5da8](https://codecov.io/gh/huggingface/transformers/pull/5291?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
<|||||>I wonder how it looks when it fails. Is it the same output you would usually see? If  that's the case, I'm all for that change!<|||||>Yes the tracebacks are completely unchanged. You just only see a `.` if the tests passes. And you don't have to scroll through `logger.info` (if you don't want to, it's still in the default circleci page).<|||||>Merging. Tag me if any issues.