Revert D25718705: Clean up type annotations in caffe2/torch/nn/modules
Test Plan: revert-hammer
Differential Revision:
D25718705 (https://github.com/pytorch/pytorch/commit/891759f8609f300203d41cccc7337089b38858bd)
Original commit changeset: 6a9e3e6d17aa
fbshipit-source-id: 1a4ef0bfdec8eb8e7ce149bfbdb34a4ad8d964b6
