In general, close should not throw exception
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                 Key: HBASE-539
                 URL: https://issues.apache.org/jira/browse/HBASE-539
             Project: Hadoop HBase
          Issue Type: Improvement
    Affects Versions: 0.16.0, 0.2.0, 0.1.0
            Reporter: stack


In particular, a close of a scanner whose lease has timed out elsewhere will 
throw an UnknownScannerException rather than just return.  Makes it so can't 
easily put the close into a finally on client side.

This issue is about reviewing all calls to close to make sure all don't throw 
exceptions gratutiously.

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