[SPARK-2546] Clone JobConf for each task (branch-1.0 / 1.1 backport)#2684

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JoshRosen wants to merge 3 commits intoapache:branch-1.1from

JoshRosen:jobconf-fix-backport

Commits on Oct 6, 2014

[SPARK-2546] [1.0 / 1.1 backport] Clone JobConf for each task.
JoshRosen
committed

Commits on Oct 7, 2014

Remove unused jobConfCacheKey field.
JoshRosen
committed

Commits on Oct 17, 2014

Add configuration option to control cloning of Hadoop JobConf.
JoshRosen
committed