LU-7746 tests: some fixes for sanity.sh with upstream kernel

LU-7746 tests: some fixes for sanity.sh with upstream kernel

sanity.sh:
- delete is_patchless() check, since this is always true today.
- remove test for "lfs getstripe --raw" added in 2.5.57
- minor style cleanups

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I6c808febe078fdc7afd89b82a04be622879cab07
Reviewed-on: http://review.whamcloud.com/19663
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>