Removing future imports from the test fixtures.
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/25296
Test Plan: Imported from OSS
Differential Revision: D17090201
Pulled By: zafartahirov
fbshipit-source-id: 5a4f6ac0ea475b55d2c610e2f9f4f0cef8690e8f
