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* Tweak docstring, audio_ext, load method signature and constructor of VCTK_092

* Add test for VCTK_092 dataset.

* Added version 0.92 of VCTK dataset
Signed-off-by: Abhishek Dubey <abhi.dubey011999@gmail.com>

librosa 0.8.0 has been released which include fix for
https://github.com/librosa/librosa/issues/1160 at
https://github.com/librosa/librosa/pull/1164

* Add spectrogram normalization option
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

This CC adds CI test to check the backward compatibility of Torchscript functions/object dumps.

The job first dumps Torchscript objects into file from torchaudio 0.6.0 release environment (x Python 3.6, 3.7, 3,8), then load & run the function in master build (in Python 3.6, 3.7, 3.8).

If there is a BC-breaking change in master build, (registration schema change), then the test should fail.

At this moment, `info` function does not work due to suspected bug in torch side, so the test is disabled for `info` function. See https://github.com/pytorch/pytorch/issues/42258 for the detail. Once https://github.com/pytorch/pytorch/issues/42258 is resolved we can enable it.

We have been running unit test with editable installation. (i.e. `python setup.py develop`), with which we missed issues like #842. 

This CC makes installation in CI non-editable, and change test directory structure so that the source code will not shadow the installed version of `torchaudio`. With simple `pytest test`, `pytest` modifies `sys.path` and prepend checked out repository, which shadows the installed version.

To remedy this, the whole test suites has been moved from `./test` to `./test/torchaudio_unittest`. This adds nice module structure to our test code and we can do absolute import in each test module, which makes it possible again to run test with `python -m unittest torchaudio_unittest/XXX.py`

This change does not affect the regular development process (`python setup.py develop` && `pytest test`)

Currently `setuptools` assumes that torhcaudio is zip safe and performs
egg (zip) installation when `python setup.py install` (or `pip install .`).

When `torchaudio` loads extension module written with Torchscript, 
the corresponding loading function requires the `so` file to be present as 
an actual file, and this does not work well with egg installation.

This CC fixes this by setting `zip_safe=False` in setup.py and disable egg
installation, so that `python setup.py install` installs uncompressed files
with regular directory structure.

Currently our test suites automatically/silently skip tests on C++ extension
if it is not available. This is nice in local env, but in CI these tests should be
enforced and reported as failure if C++ extension is not available.

This PR adds switch for making tests fail if C++ extension is not available,
and make CI for *nix fail if that's the case.

setuptools warns that it should be imported before Distutils

```
site-packages/setuptools/distutils_patch.py:25: UserWarning: Distutils was imported before Setuptools. This usage is discouraged and may exhibit undesirable behaviors or errors. Please use Setuptools' objects directly or at least import Setuptools first.
```

* Update links
* Add how to run tests
* Update asset info

* `istft` has been migrated to `pytorch`, and `torchaudio.functional.istft` has been deprecated in 0.6.0 release. This PR removes it
Co-authored-by: Jeremy Chen <jeremyyy@fb.com>

Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

Currently macOS CI job takes twice the time of linux unit tests.
This PR uses `pytest-xdist` to run unit tests in parallel on macOS CI job. 

Interestingly applying the same technique to linux unit tests make the test execution longer.
So the change is only applied to macOS.

macOS 27 mins -> 17 mins 😸
linux 14 mins -> 1 hours 😾

Now that most of our test cases are backend aware/agnostic,
the use of BACKENDS and BACKENDS_MP3 is anti-pattern.

This change moves these definitions to the legacy test module `test_io`.

If a new backend is added in future, that backend should have separate test suite,
(like the ones in `test/sox_io_backend`) so instead of dynamically listing available
backend in `test_io`, the changed code only checks "sox" backend and "soundfile" backend.

Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* Remove underscore of model name
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

* Add test for CommonVoice dataset

* Migrate the existing tests for `bg_iterator` and `diskcache_iterator` to `test/datasets/utils_test.py`
Co-authored-by: Leon Gao <legao@linkedin.com>

Co-authored-by: lawrencechen <lawrencechen@devvm3189.vll0.facebook.com>

Co-authored-by: Edward Lu <edlu@fb.com>

* Update sample rate of libritts test
Co-authored-by: Ji Chen <jimchen90@devfair0160.h2.fair>

Buck fails to run tests if they contain "-" symbol.

* Replace save/load function with sox effects chain

Part of #764

* Separate sox list format function for read and write

* Guard MP3 smoke test