Add the QA timeout for cancelling jobs

.. because with the new mechanism, the process can be slower and the job
sometimes returned successfully before it could have been cancelled.
Signed-off-by: Petr Pudlak <pudlak@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>

qa/qa_job.py

@@ -102,7 +102,7 @@ def TestJobCancellation():
   FIRST_COMMAND_DELAY = 10.0
   AssertCommand(["gnt-debug", "delay", "--submit", str(FIRST_COMMAND_DELAY)])
 
-  SECOND_COMMAND_DELAY = 1.0
+  SECOND_COMMAND_DELAY = 3.0
   master = qa_config.GetMasterNode()
 
   # Forcing tty usage does not work on buildbot, so force all output of this