remove unnecessary logging configs (#2733)

Summary:
# Before submitting

- [ ] Was this discussed/approved via a Github issue? (no need for typos, doc improvements)
- [x] Did you read the [contributor guideline](https://github.com/pytorch/fairseq/blob/master/CONTRIBUTING.md)?
- [ ] Did you make sure to update the docs?
- [x] Did you write any new necessary tests?

## What does this PR do?
It's sufficient to set logging.basicConfig in the most outside calling code like train.py or generate.py. Actually the setting of logging.basicConfig () (like [here](https://github.com/pytorch/fairseq/blob/master/fairseq_cli/generate.py#L54)) will been overwritten if logging.basicConfig is set in the inner part of the whole code.

## PR review
Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

## Did you have fun?
Make sure you had fun coding �

Pull Request resolved: #2733

Reviewed By: alexeib

Differential Revision: D24418987

Pulled By: myleott

fbshipit-source-id: 862d200023357de8947799f380e513f4c411b143

fairseq/data/audio/speech_to_text_dataset.py

@@ -23,11 +23,6 @@
 from fairseq.data.audio.feature_transforms import CompositeAudioFeatureTransform
 
 
-logging.basicConfig(
-    format="%(asctime)s | %(levelname)s | %(name)s | %(message)s",
-    datefmt="%Y-%m-%d %H:%M:%S",
-    level=logging.INFO,
-)
 logger = logging.getLogger(__name__)
 
 

fairseq/tasks/speech_to_text.py

@@ -16,11 +16,6 @@
 from fairseq.tasks import FairseqTask, register_task
 
 
-logging.basicConfig(
-    format="%(asctime)s | %(levelname)s | %(name)s | %(message)s",
-    datefmt="%Y-%m-%d %H:%M:%S",
-    level=logging.INFO,
-)
 logger = logging.getLogger(__name__)