Refine precision test message

tools/get_pr_ut.py

@@ -77,9 +77,9 @@ class PRChecker(object):
                 ut_list.append(ut.rstrip('\r\n'))
 
         if check_added_ut:
-            cmd = 'bash {}/tools/check_added_ut.sh'.format(PADDLE_ROOT)
+            cmd = 'bash {}/tools/check_added_ut.sh >/tmp/pre_ut 2>&1'.format(
+                PADDLE_ROOT)
             os.system(cmd)
-
             with open('{}/added_ut'.format(PADDLE_ROOT)) as utfile:
                 for ut in utfile:
                     ut_list.append(ut.rstrip('\r\n'))