RATIS-2346. SimpleStateMachineStorage prints too many log messages. (… #75

Job	Run time
CI / release / release	6m 3s
CI / build / build	2m 31s
CI / unit (server) / unit (server)	18m 8s
CI / unit (flaky) / unit (flaky)	4m 32s
CI / unit (misc) / unit (misc)	13m 11s
CI / basic (findbugs) / findbugs	2m 42s
CI / unit (grpc) / unit (grpc)	16m 52s
CI / basic (rat) / rat	33s
CI / basic (checkstyle) / checkstyle	39s
CI / basic (author) / author	7s
CI / repro / repro	1m 32s
CI / compile (11) / compile (11)	1m 4s
CI / compile (21) / compile (21)	1m 17s
CI / compile (17) / compile (17)	1m 13s
CI / coverage	46s
	1h 11m 10s

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