oeqa/ptest: print a warning if ptests failed

This allows spotting ptest regressions without having hard ptest failures
(for that full ptest stability should be achieved).

(From OE-Core rev: 79b54d902df2788b0822b6c9cc14705ab00e6a5b)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/runtime/cases/ptest.py

@@ -108,4 +108,5 @@ class PtestRunnerTest(OERuntimeTestCase):
             failmsg = failmsg + "Failed ptests:\n%s" % pprint.pformat(failed_tests)
 
         if failmsg:
+            self.logger.warning("There were failing ptests.")
             self.fail(failmsg)