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a22a2a83 - Add retain-output argument (#145921)

Add retain-output argument (#145921) Summary: This PR add retain-output argument which enables appending to the already existing output file if it exists instead of deleting it and creating a new one. X-link: https://github.com/pytorch/pytorch/pull/145921 Approved by: https://github.com/jansel Reviewed By: ZainRizvi, atalman Differential Revision: D69208159 fbshipit-source-id: 0d635d89a697157185fdb22999ccf7daea6319f4