Disable flaky test_invalid_names in test_rpc.py (#25916)
Summary:
pietern discovered that `test_invalid_names` is flaky on master. https://github.com/pytorch/pytorch/issues/25656 is potentially the fix. Disable this test for now and will try to add it again when https://github.com/pytorch/pytorch/issues/25656 is in.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25916
Differential Revision: D17287496
Pulled By: mrshenli
fbshipit-source-id: 9313958d3480c2bab20cd2341837c7821e3bb1b5
