distribute the master function via iterators, including consistency checks
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                 Key: ACCUMULO-367
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-367
             Project: Accumulo
          Issue Type: Improvement
          Components: master, tserver
            Reporter: Eric Newton
            Assignee: Eric Newton
             Fix For: 1.5.0


ACCUMULO-315 and ACCUMULO-365 are a result of inconsistent reads of the 
metadata table.  If we moved more of the !METADATA scan work to the tablet 
servers, and had them verify the consistency as they read, the main loop of the 
master would not have to manage consistency with secondary scans.  We could 
even restructure the main loop to execute in a distributed fashion on the 
tablet servers.

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