[SPARK-4654] Clean up DAGScheduler getMissingParentStages / stageDependsOn methods#3515

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JoshRosen wants to merge 2 commits intoapache:masterfrom

JoshRosen:dagscheduler-missingparents-cleanup

Commits on Nov 29, 2014

Clean up DAGScheduler getMissingParentStages / stageDependsOn methods.
JoshRosen
committed

Commits on Nov 30, 2014

Remove unnecessary `parents` variable.
JoshRosen
committed