In some environments, we don't really want to loop 100000 times or
allocate 152352621 buffers because it makes the tests too long to run.
This adds a way to specify "quick" values to reduce the time taken by
certain tests.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>