YARN-1732. Changed types of related-entities and primary-filters in the timeline-service to be sets instead of maps. Contributed by Billie Rinaldi.
svn merge --ignore-ancestry -c 1570914 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4@1570916 13f79535-47bb-0310-9956-ffa450edef68