[SPARK-2299] Consolidate various stageIdTo* hash maps in JobProgressListener#1262

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rxin wants to merge 6 commits intoapache:masterfrom

rxin:ui-consolidate-hashtables

Commits on Jun 29, 2014

Commits on Jul 17, 2014

Commits on Jul 18, 2014

Oops. Properly handle description.
rxin
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