test/cluster_test: make TestRegionStatistics more stable (tikv#8320) #586

Job	Run time
chunks (1, Unit Test(1))	5m 24s
chunks (1, Unit Test(1))	4m 58s
chunks (1, Unit Test(1))	4m 54s
chunks (2, Unit Test(2))	5m 7s
chunks (2, Unit Test(2))	5m 19s
chunks (2, Unit Test(2))	4m 57s
chunks (3, Unit Test(3))	5m 12s
chunks (3, Unit Test(3))	5m 13s
chunks (3, Unit Test(3))	5m 9s
chunks (4, Tests(1))	5m 22s
chunks (4, Tests(1))	5m 12s
chunks (4, Tests(1))	4m 59s
chunks (5, Tests(2))	4m 55s
chunks (5, Tests(2))	4m 47s
chunks (5, Tests(2))	5m 9s
chunks (6, Tools Test)	4m 58s
chunks (6, Tools Test)	5m 6s
chunks (6, Tools Test)	5m 34s
chunks (7, Client Integration Test)	5m 14s
chunks (7, Client Integration Test)	5m 3s
chunks (7, Client Integration Test)	5m 32s
chunks (8, TSO Integration Test)	5m 1s
chunks (8, TSO Integration Test)	5m 13s
chunks (8, TSO Integration Test)	5m 1s
chunks (9, MicroService Integration(!TSO))	5m 7s
chunks (9, MicroService Integration(!TSO))	5m 7s
chunks (9, MicroService Integration(!TSO))	5m 21s
chunks (10, MicroService Integration(TSO))	4m 56s
chunks (10, MicroService Integration(TSO))	5m 9s
chunks (10, MicroService Integration(TSO))	5m 14s
report-coverage	0s
report-coverage	0s
report-coverage	6s
	2h 34m 19s

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