RATIS-2242 change consistency criteria of heartbeat during appendLog … #3772

Job	Run time
CI / build / build	1s
CI / build / build	1s
CI / unit (grpc) / unit (grpc)	1s
CI / unit (grpc) / unit (grpc)	1s
CI / unit (server) / unit (server)	1s
CI / unit (server) / unit (server)	1s
CI / basic (findbugs) / findbugs	1s
CI / basic (findbugs) / findbugs	1s
CI / basic (checkstyle) / checkstyle	1s
CI / basic (checkstyle) / checkstyle	1s
CI / basic (rat) / rat	1s
CI / basic (rat) / rat	1s
CI / unit (misc) / unit (misc)	1s
CI / unit (misc) / unit (misc)	1s
CI / basic (author) / author	1s
CI / basic (author) / author	1s
CI / compile	0s
CI / compile	0s
CI / repro	0s
CI / repro	0s
CI / coverage	0s
CI / coverage	0s
	16s

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