Add timeout to TestBottleneck (#39191)
Summary:
Invoke `Popen.communicate` with `timeout` argument and kill the process in `TimeoutExpired` handler
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39191
Differential Revision: D21773510
Pulled By: malfet
fbshipit-source-id: 52b94315f8aa4d6c330dd5c9a8936100e49aef2d
