PIG-3380: Fix e2e test float precision related test failures when run with -Dpig.exec.mapPartAgg=true (anlilin via rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1504206 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk