[SPARK-14163][CORE] SumEvaluator and countApprox cannot reliably handle RDDs of size 1#11982

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mtustin-handy wants to merge 2 commits intoapache:masterfrom mtustin-handy:SPARK-14163

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Commits on Mar 26, 2016

Use confidence when count is 1.
mtustin-handy
committed

Commits on Mar 28, 2016

Set infinite confidence if count is 1 or otherwise confidence would be NaN.
mtustin-handy
committed