HRegionServer.checkFileSystem() should only abort() after fs is down for some 
time
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                 Key: HBASE-5668
                 URL: https://issues.apache.org/jira/browse/HBASE-5668
             Project: HBase
          Issue Type: Improvement
            Reporter: Prakash Khemani


When checkFileSystem() fails then the region server should wait for sometime 
before aborting. By default, the timeout can be same as zookeeper session 
timeout.

When say a rack switch reboots or fails for a few minutes, and all the traffic 
to the region server dies ... then we don't want the region servers to 
unnecessarily kill themselves when ongoing compactions or flushes fail.

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