Install TensorRT lib on oss docker and enable fx2trt unit test (#70203)
Summary:
CI
Lib installed and unit test run on https://github.com/pytorch/pytorch/actions/runs/1604076060
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70203
Reviewed By: malfet
Differential Revision: D33264641
Pulled By: wushirong
fbshipit-source-id: ba30010bbd06e70d31415d8c52086d1779371bcf
