HBASE-8984 Test online snapshots with online merge

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HBASE-9007 TestReplicationKillSlaveRS.killOneSlaveRS fails; ADDENDUM/FIX

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HBASE-9012 TestBlockReorder.testBlockLocationReorder fails

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HBASE-9018 Add timeouts on all tests in TestHLogSplit

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HBASE-8690 Reduce unnecessary getFileStatus hdfs calls in TTL hfile and hlog cleanners

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HBASE-8954 TestSplitLogWorker#testPreemptTask failed

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HBASE-9017 Consolidate ChaosMonkey's random objects

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HBASE-9021 Create a unit test for ReplicationHLogReaderManager

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