[YARN][SPARK-4929] Bug fix: fix the yarn-client code to support HA#3771

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SaintBacchus wants to merge 2 commits intoapache:masterfrom

SaintBacchus:YarnHA

Commits on Dec 23, 2014

Bug fix: fix the yarn-client code to support HA
SaintBacchus
committed

Commits on Jan 4, 2015

Improve the comment of the funciton 'getDefaultFinalStatus'
SaintBacchus
committed