[s2s] tiny QOL improvement: run_eval prints scores
its annoying to have to cat a file to see the scores after calling run_eval.py
# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/6341?src=pr&el=h1) Report
> Merging [#6341](https://codecov.io/gh/huggingface/transformers/pull/6341?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/322dffc6c9a44fd504b24b0efcbcaa419b577a93&el=desc) will **increase** coverage by `0.13%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/6341/graphs/tree.svg?width=650&height=150&src=pr&token=9qOlN6Hb1c)](https://codecov.io/gh/huggingface/transformers/pull/6341?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #6341      +/-   ##
==========================================
+ Coverage   78.37%   78.51%   +0.13%     
==========================================
  Files         148      148              
  Lines       27196    27196              
==========================================
+ Hits        21316    21354      +38     
+ Misses       5880     5842      -38     
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/6341?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [src/transformers/modeling\_tf\_flaubert.py](https://codecov.io/gh/huggingface/transformers/pull/6341/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9mbGF1YmVydC5weQ==) | `24.53% <0.00%> (-63.20%)` | :arrow_down: |
| [src/transformers/generation\_tf\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/6341/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9nZW5lcmF0aW9uX3RmX3V0aWxzLnB5) | `86.71% <0.00%> (+0.25%)` | :arrow_up: |
| [src/transformers/modeling\_tf\_distilbert.py](https://codecov.io/gh/huggingface/transformers/pull/6341/diff?src=pr&el=tree#diff-c3JjL3RyYW5zZm9ybWVycy9tb2RlbGluZ190Zl9kaXN0aWxiZXJ0LnB5) | `97.41% <0.00%> (+32.94%)` | :arrow_up: |

------

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