HDFS-4943. WebHdfsFileSystem does not work when original file path has encoded chars.  Contributed by Jerry He


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1498962 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HADOOP-9016-trunk-gd