[SPARK-7878] Rename Stage.jobId to firstJobId #6418
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The previous name was confusing, because each stage can be associated with
many jobs, and jobId is just the ID of the first job that was associated
with the Stage. This commit also renames some of the method parameters in
DAGScheduler.scala to clarify when the jobId refers to the first job ID
associated with the stage (as opposed to the jobId associated with a job
that's currently being scheduled).
cc @markhamstra @JoshRosen (hopefully this will help prevent future bugs like SPARK-6880)