HDFS-5488. Clean up TestHftpURLTimeout. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1540894 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5495. Remove further JUnit3 usages from HDFS. Contributed by Jarek Jarcec Cecho.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1540914 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HADOOP-9281-trunk-gd