YARN-1729. Made TimelineWebServices deserialize the string primary- and secondary-filters param into the JSON-compatible object. Contributed by Billie Rinaldi.
svn merge --ignore-ancestry -c 1573825 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1573826 13f79535-47bb-0310-9956-ffa450edef68