Changed punybench script to use faster tests

Changed the punybench script to use parameters that let the
tests run much faster. 5m22s on stumpy, 20m45s on daisy.

BUG=chromium-os:35390
TEST=kernel_fs_Punybench --args=--disk

Change-Id: I6f05af973c8a2463f87aa7844fa9c6ecd7eae269
Reviewed-on: https://gerrit.chromium.org/gerrit/41592
Reviewed-by: Mike Truty <truty@chromium.org>
Commit-Queue: Paul Taysom <taysom@chromium.org>
Tested-by: Paul Taysom <taysom@chromium.org>
1 file changed