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Summary:
when reading the subprocess stdout to prevent extra new lines in output
Inspired by https://github.com/uber-go/zap/blob/0ba452dbe15478739ad4bab1067706018a3062c6/zapio/writer.go#L100
ttpforge reads stdout/stderr inaccurately causing such lines in logs:
the code: https://fburl.com/code/52hzjy4j
Differential Revision: D66702400