HBASE-11011 Avoid extra getFileStatus() calls on Region startup

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HBASE-11037 Race condition in TestZKBasedOpenCloseRegion.

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1588611 13f79535-47bb-0310-9956-ffa450edef68
HBASE-11030 HBaseTestingUtility.getMiniHBaseCluster should be able to return null.

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