MAPREDUCE-5487. In task processes, JobConf is unnecessarily loaded again in Limits (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1524408 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5219. Add configuration keys for retry policy in WebHDFSFileSystem. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1524498 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk