[SPARK-15083] [Web UI] History Server can OOM due to unlimited TaskUIData#14673

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ajbozarth wants to merge 4 commits intoapache:masterfrom

ajbozarth:spark15083

Commits on Aug 12, 2016

Added optonal task trimming (based on @tankkyo code)
ajbozarth
committed

Commits on Aug 16, 2016

edited text to be less confusing in case of application error
ajbozarth
committed

Commits on Aug 17, 2016

updated tasks hash so trimming is simplier and simlified confs
ajbozarth
committed

Commits on Aug 18, 2016

updated config impl and fixed test cases
ajbozarth
committed