pytorch quantization ao migration phase 2: caffe2/test (#65832)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65832
Renames `torch.quantization` to `torch.ao.quantization` in `caffe2/test`
folder.
```
find caffe2/test/ -type f -name "*.py" -print0 | xargs -0 sed -i "s/torch\.quantization/torch.ao.quantization/g"
HG: manually revert the files testing this migration
hg revert caffe2/test/quantization/ao_migration/common.py
hg revert caffe2/test/quantization/ao_migration/test_ao_migration.py
```
Test Plan: CI
Reviewed By: z-a-f
Differential Revision: D31275754
fbshipit-source-id: 4ed54a74525634feb0f47a26d071102e19c30049
