Minor clean up for test_jit (#15368)
Summary:
* remove None args in functional tests
* remove some expect files that are not necessary
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15368
Differential Revision: D13512349
Pulled By: wanchaol
fbshipit-source-id: 304cffff966487d15c373057ae8ad114ef8aa7f9
