Fix GPU nighties test (#1901)

Summary:
This should fix the GPU nighties.

The rationale for the cp is that there is a shared file between the CPU and GPU tests.

Ideally, this file should probably moved to contrib at some point.

Pull Request resolved: #1901

Reviewed By: beauby

Differential Revision: D28680898

Pulled By: mdouze

fbshipit-source-id: b9d0e1969103764ecb6f1e047c9ed4bd4a76aaba

conda/faiss-gpu/meta.yaml

@@ -76,6 +76,7 @@ outputs:
         - pytorch
       commands:
         - python -m unittest discover tests/
+        - cp tests/common_faiss_tests.py faiss/gpu/test
         - python -m unittest discover faiss/gpu/test/
         - sh test_cpu_dispatch.sh  # [linux]
       files: