[SPARK-2490] Change recursive visiting on RDD dependencies to iterative approach#1418

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viirya wants to merge 4 commits intoapache:masterfrom

viirya:remove_recursive_visit

Commits on Jul 15, 2014

change recursive visiting on rdd's dependencies to iterative approach to avoid stackoverflowerror.
viirya
committed

Commits on Jul 27, 2014

comply with code style.
viirya
committed

Commits on Jul 30, 2014

add comments to explain Stack usage.
viirya
committed

Commits on Jul 31, 2014

change function name; comply with code style.
viirya
committed