redis-benchmark: make show throughput in only one thread. (#9146)
In multipe threads mode, every thread output throughput info. This may cause some problems: - Bug in https://github.com/redis/redis/pull/8615; - The show throughput is called too frequently; - showThroughput which updates shared variable lacks synchronization mechanism. This commit also reverts changes in #8615 and changes time event interval to macro.
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