RATIS-2318. Add a test to show how to manually restore a snapshot. #62

Job	Run time
CI / build / build	1m 25s
CI / release / release	5m 26s
CI / basic (author) / author	10s
CI / basic (checkstyle) / checkstyle	31s
CI / unit (server) / unit (server)	17m 37s
CI / basic (findbugs) / findbugs	2m 5s
CI / basic (rat) / rat	20s
CI / unit (misc) / unit (misc)	13m 7s
CI / unit (grpc) / unit (grpc)	17m 24s
CI / unit (flaky) / unit (flaky)	5m 40s
CI / repro / repro	1m 18s
CI / compile (11) / compile (11)	1m 3s
CI / compile (21) / compile (21)	1m 7s
CI / compile (17) / compile (17)	1m 5s
CI / coverage	0s
CI / basic (author) / author	10s
CI / basic (checkstyle) / checkstyle	31s
CI / unit (grpc) / unit (grpc)	17m 30s
CI / unit (server) / unit (server)	17m 37s
CI / basic (findbugs) / findbugs	2m 5s
CI / unit (misc) / unit (misc)	13m 7s
CI / unit (flaky) / unit (flaky)	5m 40s
CI / basic (rat) / rat	20s
CI / repro / repro	1m 18s
CI / compile (21) / compile (21)	1m 7s
CI / compile (11) / compile (11)	1m 3s
CI / compile (17) / compile (17)	1m 5s
CI / release / release	5m 26s
CI / build / build	1m 25s
CI / coverage	0s
	2h 16m 42s

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