[SPARK-18099][YARN] Fail if same files added to distributed cache for --files and --archives#15627

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kishorvpatil wants to merge 5 commits intoapache:masterfrom

kishorvpatil:spark18099

Commits on Oct 27, 2016

Dist cache yarn during submit should throw error for adding same file under archives and files
kishorvpatil
committed

Commits on Oct 28, 2016

Commits on Oct 31, 2016

Adding comment and unit tests
kishorvpatil
committed

Commits on Nov 3, 2016

Updating unit test cover all three scenarios.
kishorvpatil
committed