ADD: URLCat
Use: URLCat hdfs:///user/ydai/filename
A little weird why we need this line: FileSystem.getFileSystemClass("file", conf);
ADD: dyc.tools.FileSystemCat
The recommend approach to read.
hdfs:///user/ydai/file is equals to hdfs://host/user/ydai/file
     (triple slash)                      (double slash appended by host name)
ADD: ShowFileStatusTest
Using import static