rpl.sec_behind_master-5114 fails sporadically in buildbot

rpl.sec_behind_master-5114 'stmt'        w2 [ fail ]

        Test ended at 2015-07-21 06:30:48

CURRENT_TEST: rpl.sec_behind_master-5114

--- /var/lib/buildbot/maria-slave/power8-vlp04-bintar/build/mysql-test/suite/rpl/r/sec_behind_master-5114.result	2015-07-21 02:29:21.581055813 -0400

+++ /var/lib/buildbot/maria-slave/power8-vlp04-bintar/build/mysql-test/suite/rpl/r/sec_behind_master-5114.reject	2015-07-21 06:30:47.677517323 -0400

@@ -3,7 +3,7 @@

 call mtr.add_suppression("Unsafe statement written to the binary log");

 CREATE TABLE t1 (a int);

 INSERT INTO t1 VALUES(SLEEP(2));

-Seconds_Behind_Master: 1

+Seconds_Behind_Master: 2

 Warnings:

 Note	1592	Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT. Statement is unsafe because it uses a system function that may return a different value on the slave.

 drop table t1;

mysqltest: Result content mismatch