Currently the testsuite always try to extract the expected output from the test case description. This is done with grep & sed. But in some case we're not interested to compare the actual output with the expected one. And in those cases the grep & sed are just wasted CPU cycles. Fix this by extracting the expected output only when we know that it won't be ignored. This speedup the testsuite by a modest 1%. Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>