Hive should adapt new FsShell commands since Hadoop 2 has changed FsShell argument structures

A simple example is that hive calls "-rmr" in the FsShell class, which in Hadoop 2 is "rm -r". This helps avoid printing an unnecessary Deprecated warning in Hive when the Hadoop23 (or hadoop-2) shim is in use.

We should wrap the logic and call the right commands of hadoop-2 to avoid this.