Review Request: [rest/stargate] Improve error response when trying to create a scanner on a nonexistant table

[Andrew Purtell]

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http://review.cloudera.org/r/977/
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Review request for hbase.


Summary
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Return 404 when an attempt is made to create a scanner on a nonexistent table. 


This addresses bug HBASE-2907.
    http://issues.apache.org/jira/browse/HBASE-2907


Diffs
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  src/main/java/org/apache/hadoop/hbase/rest/ScannerResource.java 6ee7230 
  src/test/java/org/apache/hadoop/hbase/rest/TestScannerResource.java bc9fb8b 

Diff: http://review.cloudera.org/r/977/diff


Testing
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New unit test, passes.


Thanks,

Andrew