nomnigraph - easy - use new test utils in converter_nomnigraph_test (#15751)
Summary:
Use new test utils in converter_nomnigraph_test , and add utils to set device option name, external inputs, outputs.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15751
Differential Revision: D13586228
Pulled By: duc0
fbshipit-source-id: ff809dd7bf9f30641ce2a6fef7e2810f005521c2
