[SPARK-18103][Follow-up][SQL][Minor] Rename `MetadataLogFileCatalog` to `MetadataLogFileIndex`#15712

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lw-lin wants to merge 1 commit intoapache:masterfrom

Commits on Nov 1, 2016

Rename `MetadataLogFileCatalog.scala` to `MetadataLogFileIndex.scala`
lw-lin
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