HDFS-4512. Cover package org.apache.hadoop.hdfs.server.common with tests. Contributed by Vadim Bondarev.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1528097 13f79535-47bb-0310-9956-ffa450edef68
YARN-1010. FairScheduler: decouple container scheduling from nodemanager heartbeats. (Wei Yan via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1528192 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5544. JobClient#getJob loads job conf twice. (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1528196 13f79535-47bb-0310-9956-ffa450edef68
YARN-1228. Clean up Fair Scheduler configuration loading. (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1528201 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk