MAPREDUCE-5367. Local jobs all use same local working directory (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510610 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5061. Make FSNameSystem#auditLoggers an unmodifiable list. Contributed by Arpit Agarwal.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1510611 13f79535-47bb-0310-9956-ffa450edef68