Skip c2 ref onnx model tests (#37591)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37591
skip the tests since gluster is gone.
Test Plan: ci
Reviewed By: ezyang
Differential Revision: D21330359
fbshipit-source-id: a4e158fb72eddb08ba49fcfa9541569a150f8481
