[SPARK-4485][SQL] (1) Add broadcast hash outer join, (2) Fix SparkPlanTest#7162

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kai-zeng wants to merge 4 commits intoapache:masterfrom

Commits on Jul 1, 2015

Commits on Jul 2, 2015

Use CanBroadcast in broadcast outer join planning
kai
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Commits on Jul 4, 2015

Fix not-serializable exception for code-generated keys in broadcasted relations
kai
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