nightly-runtime-abi-1

Make unit tests use a temp dir instead of /home/ec2-user (#126)

Summary:
As title.

Pull Request resolved: https://github.com/pytorch/multipy/pull/126

Reviewed By: PaliC

Differential Revision: D38633472

Pulled By: anirbanr-fb-r2p

fbshipit-source-id: a027d7fbd3088ac8efdd7ab318ec918ba0e1f4d2