[SPARK-13923][SPARK-14014][SQL] Session catalog follow-ups#12006

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andrewor14 wants to merge 4 commits intoapache:masterfrom

andrewor14:session-catalog-followup

Commits on Mar 28, 2016

Create temporary table: rename ignoreIfExists
Andrew Or
committed
Don't use ConcurrentHashMap and document thread-safety
Andrew Or
committed
Rename CatalogFunction/CatalogTable name -> identifier
Andrew Or
committed
HiveCatalog -> HiveExternalCatalog
Andrew Or
committed