HBASE-9605 Allow AggregationClient to skip specifying column family for row count aggregate



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1526987 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9583 add documentation for getShortMidpointKey (Liang Xie)


git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1526992 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9548 Cleanup SnapshotTestingUtils

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1527020 13f79535-47bb-0310-9956-ffa450edef68