Handle "NotSupported" status by default implementation of Close() in … #10127
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…Directory/FSDirectory classes.
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Summary:
The default implementation of Close() function in Directory/FSDirectory classes returns
NotSupportedstatus. However, we don't want operations that worked in older versions to begin failing after upgrading when run on FileSystems that have not implemented Directory::Close() yet. So we require the upper level that calls Close() function should properly handle "NotSupported" status instead of treating it as an error status.