LU-2416 test: Some test using wrong lctl params

LU-2416 test: Some test using wrong lctl params

With the move of obdfilter to ofd some of the lctl
parameters got moved around. For the test suite a function
{get,set}_obdfilter_param was written to handle this change so
this patch updates a few more test to use this api.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I05ca4711b198061de1378b79d2f7f35d5a1c75af
Reviewed-on: http://review.whamcloud.com/4726
Reviewed-by: Li Wei <wei.g.li@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>