HBASE-9647 Add a test in TestAsyncProcess to check the number of threads created

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1526829 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9583 add documentation for getShortMidpointKey (Liang Xie)


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HBASE-9548 Cleanup SnapshotTestingUtils

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HBASE-9672 LoadTestTool NPE's when -num_tables is given, but -tn is not

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