[SPARK-20926][SQL] Removing exposures to guava library caused by directly accessing SessionCatalog's tableRelationCache#18148

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Commits on May 30, 2017

[SPARK-20926][SQL] Removing exposures to guava library through directly accessing SessionCatalog's tableRelationCache
Reza Safi
committed

Commits on Jun 2, 2017

Making tableRelationCache private and updating the comments.
Reza Safi
committed
Fixing scalastyle check errors
Reza Safi
committed
Changing the names for two of the methods.
Reza Safi
committed