split remaining "easy" tests (#29249)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29249
This splits out all the tests that are "easy", leaving `TestJit`,
`TestScript`, the autogenerated tests, and a small docs test.
Splitting those into reasonable chunks is more effort which is less
mechanical.
Differential Revision: D18339007
Test Plan: Imported from OSS
Pulled By: suo
fbshipit-source-id: 69164b9f9a2c379fe8923a846c98dd3c37ccb70e
