Temporarily fix hub SSL cert issue (#25042)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25042
[ci pytorch_linux_xenial_cuda9_cudnn7_py2_test]
Test Plan: Imported from OSS
Differential Revision: D16974162
Pulled By: jamesr66a
fbshipit-source-id: 52b00dec748b2704941f634b7a9a3671a2627b89
