Enhance hbck to sideline overlapped mega regions
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                 Key: HBASE-5719
                 URL: https://issues.apache.org/jira/browse/HBASE-5719
             Project: HBase
          Issue Type: New Feature
          Components: hbck
    Affects Versions: 0.94.0, 0.96.0
            Reporter: Jimmy Xiang
            Assignee: Jimmy Xiang
             Fix For: 0.96.0


If there are too many regions in one overlapped group (by default, more than 
10), hbck currently doesn't merge them since it takes time.
In this case, we can sideline some regions in the group and break the 
overlapping to fix the inconsistency.  Later on, sidelined regions can be bulk 
loaded manually.

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