RATIS-2227. LogEntryProto leak in SegmentedRaftLog (#1199) #3702

Job	Run time
CI / build / build	1m 20s
CI / basic (findbugs) / findbugs	1m 50s
CI / basic (author) / author	6s
CI / basic (checkstyle) / checkstyle	31s
CI / unit (grpc) / unit (grpc)	11m 24s
CI / basic (rat) / rat	14s
CI / unit (misc) / unit (misc)	7m 2s
CI / unit (server) / unit (server)	12m 41s
CI / repro / repro	1m 10s
CI / compile (11) / compile (11)	1m 2s
CI / compile (21) / compile (21)	1m 5s
CI / compile (17) / compile (17)	59s
CI / coverage	2m 43s
	42m 7s

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