LU-814 test: automated NFS over lustre testing

LU-814 test: automated NFS over lustre testing

Provide setup nfs within auster framework
Note: this change includes LU-1134, LU-1213

Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Change-Id: If28a237a23cd448c7d8b9a772a4b8951d94697ef
Reviewed-on: http://review.whamcloud.com/2593
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Bob Glossman <bogl@whamcloud.com>
Tested-by: Bob Glossman <bogl@whamcloud.com>
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>