Add psutil to requirements.txt (#52285)
Summary:
psutil is used in many test scripts under test/
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52285
Reviewed By: jbschlosser
Differential Revision: D26516673
Pulled By: malfet
fbshipit-source-id: 09a81d5dba3bf5189e3e5575c2095eb069b93ade
