LU-4770 tests: tests scripts simplification

LU-4770 tests: tests scripts simplification

1. Xeon Phi don't support "mount -t lustre", we can use only
   "mount.lustre" utility.
2. A "head" utility don't support shortcut "-1" option.
   It should be specified as "-n 1".
3. A "sed" utility don't support expression "s/[-.]/ /3"

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Change-Id: Ib5ba22451819772ebacb38706447403ae6668cc4
Reviewed-on: http://review.whamcloud.com/9668
Tested-by: Jenkins
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Minh Diep <minh.diep@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>