remove unused args/kwargs
remove unused args/kwargs

looks like we don't pass anything to helper

Change-Id: I245d858b1f4704c32d4f49d6840ec19f40d40f5f
Reviewed-on: http://review.couchbase.org/37143
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Li Yang <b23b5fb240ae87c71e4667a21ecd9f27d5443975@gmail.com>

couchbase/perfrunner,hsharsha/perfrunner,vmx/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner,mikewied/perfrunner,thomas-couchbase/perfrunner,EricACooper/perfrunner,EricACooper/perfrunner,hsharsha/perfrunner,thomas-couchbase/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner,EricACooper/perfrunner,couchbase/perfrunner,dkao-cb/perfrunner,PaintScratcher/perfrunner,couchbase/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner,mikewied/perfrunner,vmx/perfrunner,PaintScratcher/perfrunner,pavel-paulau/perfrunner,dkao-cb/perfrunner,EricACooper/perfrunner,pavel-paulau/perfrunner