Multi-column scanner unit test
------------------------------

                 Key: HBASE-4062
                 URL: https://issues.apache.org/jira/browse/HBASE-4062
             Project: HBase
          Issue Type: Improvement
          Components: regionserver, test
    Affects Versions: 0.94.0
            Reporter: Mikhail Bautin
            Assignee: Mikhail Bautin
            Priority: Minor


Adding a unit test for the multi-column scanner. We are using this this to test 
an optimization we are making to multi-column scans using row-column Bloom 
filters. The scanner creates multiple StoreFiles for a single column family, 
each containing a randomized set of columns with different timestamps, and then 
tests scanning through the whole region with all possible sets of columns 
specified in the query. Point deletes (deletes of a specific timestamp) are 
also tested.

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