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-2.4@1580964 13f79535-47bb-0310-9956-ffa450edef68