If we get IOException when closing a region, we should still remove it from 
online regions and complete the close in ZK
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                 Key: HBASE-3207
                 URL: https://issues.apache.org/jira/browse/HBASE-3207
             Project: HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.90.0
            Reporter: Jonathan Gray
            Assignee: Jonathan Gray
             Fix For: 0.90.0


Ran into issue on cluster where HDFS was taken out from under it.  RS 
eventually tried to shut itself down.  As regions were being closed, they got 
IOException "Filesystem closed".  In the CloseRegionHandlers, this was causing 
the close operation to not finish (in ZK and in the online region list in RS).  
That, in turn, held up the waitOnAllRegionsToClose() so the RS never shut down.

If we get an IOException during a close, which can happen if fatal error doing 
flush, this is not recoverable so we should complete the region close in ZK and 
by removing from map of online regions on that RS.

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