HADOOP-9379. capture the ulimit info after printing the log to the console. Contributed by Arpit Gupta.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1455316 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4391. TestDataTransferKeepalive fails when tests are executed in a certain order. Contributed by Andrew Wang.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1455343 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4311-trunk-gd