HADOOP-9976. Different versions of avro and avro-maven-plugin (Karthik Kambatla via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1526667 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5513. ConcurrentModificationException in JobControl. Contributed by Robert Parker


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1526688 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk