LU-937 tests: fix CLIENTONLY mode for KNL testing

LU-937 tests: fix CLIENTONLY mode for KNL testing

Use default values if getconf utility is absent.
Add missing checks for remote servers availability.
Add checks for invalid options for cmp and find utilities.
Fix test_32 cleanup routine.

Change-Id: Ibaa636c62d202741ad86b6dc1711c6971b34c704
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-on: http://review.whamcloud.com/20312
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Emoly Liu <emoly.liu@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>