HBASE-8984 Test online snapshots with online merge

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1505791 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9007 TestReplicationKillSlaveRS.killOneSlaveRS fails; ADDENDUM/FIX

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HBASE-9012 TestBlockReorder.testBlockLocationReorder fails

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.95@1505807 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9018 Add timeouts on all tests in TestHLogSplit

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