Add a command-line option to specify the HDFS volume

[joeledwards]

I am unable to figure out how to point at a specific HDFS volume from the documentation associated with this project. I think it would simplify things to have a new option to support this and make the tool more useful "out of the box" for those who are new to hadoop/hdfs (such as myself) and are just looking to inspect the contents of a volume.

Here is the output from after the splash screen when running hadoopcli without any arguments:

java.lang.IllegalArgumentException: Wrong FS: hdfs://file:/user/joel, expected: file:///
	at org.apache.hadoop.fs.FileSystem.checkPath(FileSystem.java:785)
	at org.apache.hadoop.fs.RawLocalFileSystem.pathToFile(RawLocalFileSystem.java:89)
	at org.apache.hadoop.fs.RawLocalFileSystem.deprecatedGetFileStatus(RawLocalFileSystem.java:645)
	at org.apache.hadoop.fs.RawLocalFileSystem.getFileLinkStatusInternal(RawLocalFileSystem.java:939)
	at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:640)
	at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:456)
	at com.cloudera.utils.hadoop.hdfs.shell.command.HdfsCd.implementation(HdfsCd.java:109)
	at com.cloudera.utils.hadoop.shell.command.AbstractCommand.execute(AbstractCommand.java:143)
	at com.cloudera.utils.hadoop.shell.AbstractShell.processCommand(AbstractShell.java:355)
	at com.cloudera.utils.hadoop.shell.AbstractShell.processInput(AbstractShell.java:269)
	at com.cloudera.utils.hadoop.HadoopSession$1.call(HadoopSession.java:1122)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
	at java.base/java.lang.Thread.run(Thread.java:832)
Wrong FS: hdfs://file:/user/joel, expected: file:///.
Attempted to set home directory.  User home directory must exist.
If user is 'hdfs', consider using a proxy account for audit purposes.
Failed to Connect
Initialization Issue.