HBASE-9583 add documentation for getShortMidpointKey (Liang Xie)


git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1526993 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9548 Cleanup SnapshotTestingUtils

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1527018 13f79535-47bb-0310-9956-ffa450edef68