break out test_recursive_script (#27819)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27819
The idea here is to preserve the fact that `test_jit.py` contains all the JIT tests. So we import `JitTestCase`s from `jit/` into `test_jit.py` so that the test loader will find and run them when you do `python test_jit.py`. This also means that things like `-k` will work as expected.
The individual test files in `jit/` will throw if run directly, to prevent cases where the CI accidentally runs multiple versions of the same test.
Differential Revision: D17898105
Test Plan: Imported from OSS
Pulled By: suo
fbshipit-source-id: 0cd6f8421c86c90a6e1bae33a3fdbe998f570e07
