LU-780 test: improve parallel-scale to support hyperion run

LU-780 test: improve parallel-scale to support hyperion run

We need to add support for srun/slurm, and a few tests
from hyperion-sanity script that has been used for hyperion
testing

Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Change-Id: I7f1baa0c99980ad9001436911d23f1030aa7d0fe
Reviewed-on: http://review.whamcloud.com/1615
Tested-by: Hudson
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Cliff White <cliffw@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>