Support generic Hadoop Compatible Filesystem (short version)

This is a short version of #388.
it is loaded by Configuration.addResource() in this line 
https://github.com/amplab/tachyon/pull/437/files#diff-9d99c1575202d9b0eff11cf7f2b8b1fbR59

Configuration.addResource() looks for the file through classpath, so we have to expand classpath in this line
https://github.com/amplab/tachyon/pull/437/files#diff-357e4854869b2e21c38b1b437f11095aR297