[performance] have openscanner return scan results, currently returns scan id 
only
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                 Key: HBASE-2660
                 URL: https://issues.apache.org/jira/browse/HBASE-2660
             Project: HBase
          Issue Type: Improvement
            Reporter: stack


For short scans in particular, say paging data, having to do two rpcs will be 
costly -- the one to open scanner and then the second to call next on the 
just-opened scanner (IIRC, the Get as a Scan doesn't suffer this issue).

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