Move Quantization Models to common_quantization (#22706)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22706
Moved the models used for quantization test from the test_quantization.py file to common_quantization.py
Reviewed By: jerryzh168
Differential Revision: D16189865
fbshipit-source-id: 409b43454b6b3fe278ac16b1affb9085d6ed6835