[SPARK-7438][Spark Core]Fixed validation of relativeSD in countApproxDistinct#5974

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vinodkc wants to merge 5 commits intoapache:masterfrom

vinodkc:fix_countApproxDistinct_Validation

Commits on May 7, 2015

Fixed validation of relativeSD in countApproxDistinct
Vinod K C
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Commits on May 8, 2015

Removed relativeSD validation from python API,RDD.scala will do validation
Vinod K C
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Remove blank line
Vinod K C
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Removed testcase to assert IAE when relativeSD>3.7
Vinod K C
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Reverted removal of validation relativeSD<0.000017
Vinod K C
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