rename ncclPutSignal(wait) to ncclPutSignal_old, and ncclPutSignal_v2 to ncclPutSignal, and add comments to avoid further usage of ncclPutSignal_old; similar renaming applies to ncclWaitSignal and ncclWaitSignal_v2#58
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elvinlife wants to merge 1 commit intometa-pytorch:mainfrom
