[Linaro-validation] ptest.py script seems to generate not really informative results

Hi,

I launched util-linux ptest using automated/linux/ptest/ptest.yaml from https://git.linaro.org/qa/test-definitions.git and received the following results: https://pastebin.com/nj9PYQzE

As you can see some tests failed. However, case util-linux marked as passed. It looks like ptest.py only analyze return code of ptest-runner -d <ptest_dir> <ptest_name> command. And since ptest-runner finishes correctly exit code is 0. Therefore all tests are always marked as passed, and users never know when some of the tests fail.

Maybe it worth to analyze each test?

Best regards, Alex