MAPREDUCE-5830. Added back the private API HostUtil.getTaskLogUrl(..) for binary compatibility with older clients like Hive 0.13. Contributed by Akira Ajisaka.
svn merge --ignore-ancestry -c 1604232 ../branch-2.4


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4.1@1604235 13f79535-47bb-0310-9956-ffa450edef68