Working Directory patch to force hadoop < 1.2 to use /user/{user.name}/ ...

This fixes errors that occur with unqualified paths in a typical hadoop workflow, for example: 

"hadoop fs -put localfile dfsfile"

In the above command, hadoop 1.2 and earlier RawLocalFileSYStem implementations assume that the "user.dir" is the directory which unqualified files should go in.  

To prevent this behaviour, we now make sure that this initial working directory is set to the current working directory when any GlusterVolume based FileSystem is created.