Minor cleanup for TestFuser tests (#15134)
Summary:
Changelog:
- change some expect tests that didn't have to be expect tests,
instead use self.assertAllFused
- Some of the fuser tests weren't using self.assertAllFused.
- Minor test renames
cc apaszke
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15134
Differential Revision: D13507481
Pulled By: zou3519
fbshipit-source-id: dd0788530a60bb5ed2f42b961fae3db2b4404b64