Move the change log of HADOOP-3519 to release 0.18.0 section.
Move the change log of HADOOP-3519 to release 0.18.0 section.

git-svn-id: 5be3658b1da2303116c04834c161daea58df9cc4@669589 13f79535-47bb-0310-9956-ffa450edef68

awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop,awylie/hadoop