YARN-1838. Enhanced timeline service getEntities API to get entities from a given entity ID or insertion timestamp. Contributed by Billie Rinaldi.
svn merge --ignore-ancestry -c 1580960 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1580961 13f79535-47bb-0310-9956-ffa450edef68
YARN-1670. aggregated log writer can write more log data then it says is the log length (Mit Desai via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1580963 13f79535-47bb-0310-9956-ffa450edef68