HDFS-5803. TestBalancer.testBalancer0 fails. Contributed by Chen He.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1569391 13f79535-47bb-0310-9956-ffa450edef68
YARN-1721. When moving app between queues in Fair Scheduler, grab lock on FSSchedulerApp (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1569443 13f79535-47bb-0310-9956-ffa450edef68
YARN-1724. Race condition in Fair Scheduler when continuous scheduling is turned on (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1569447 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5893. HftpFileSystem.RangeHeaderUrlOpener uses the default URLConnectionFactory which does not import SSL certificates. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1569477 13f79535-47bb-0310-9956-ffa450edef68