fix resource_test to not exceed resource limit

test/tests/resource_test.py

@@ -5,7 +5,7 @@ for k in sorted(dir(resource)):
         continue
     print k, getattr(resource, k)
 
-TIME_LIMIT = 100
+TIME_LIMIT = 5
 resource.setrlimit(resource.RLIMIT_CPU, (TIME_LIMIT + 1, TIME_LIMIT + 1))
 
 MAX_MEM_MB = 100

tools/tester.py

@@ -238,6 +238,8 @@ def run_test(fn, check_stats, run_memcheck):
             failed.append(fn)
             return r
         else:
+            # show last line of stderr so we have some idea went wrong
+            print "Last line of stderr: " + last_stderr_line
             raise Exception(msg)
 
     elif out != expected_out: