Remove unused fstat() call from NativeIO
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Key: HADOOP-7173
URL: https://issues.apache.org/jira/browse/HADOOP-7173
Project: Hadoop Common
Issue Type: Improvement
Affects Versions: 0.22.0
Reporter: Todd Lipcon
Fix For: 0.22.0
After HADOOP-7115, we don't need the fstat() native call or Stat class anymore.
Let's remove them to cut down on unneeded code.
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