HDFS-5363. Refactor WebHdfsFileSystem: move SPENGO-authenticated connection creation to URLConnectionFactory. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1535169 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5341. Reduce fsdataset lock duration during directory scanning. Contributed by Qus-Jiawei.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1535188 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10064. Upgrade to maven antrun plugin version 1.7 (Arpit Agarwal via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1535265 13f79535-47bb-0310-9956-ffa450edef68
Merging r1535122 through r1535532 from trunk to HDFS-2832

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2832@1535534 13f79535-47bb-0310-9956-ffa450edef68