Add slurm_exclude arg to distributed userbenchmarks (#1309)
Summary:
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1309
Allow excluding bad nodes from slurm allocation - I find I need to patch this frequently, might as well commit the change.
Test Plan: Imported from OSS
Reviewed By: xuzhao9
Differential Revision: D41330289
Pulled By: davidberard98
fbshipit-source-id: 80adcde569afa0bd7c0e778c09b98fc5e2dfe02a
