HBASE-8021 TestSplitTransactionOnCluster.testShouldThrowIOExceptionIfStoreFileSizeIsEmptyAndShouldSuccessfullyExecuteRollback() fails consistently

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1453717 13f79535-47bb-0310-9956-ffa450edef68