Test test_service_sql_api.test_sql_errors is failing on 5.7 trunk

Test test_service_sql_api.test_sql_errors is failing on 5.7 trunk:

16:46:34 +Timeout in wait_condition.inc for SELECT COUNT(*)=@expected_thread_count FROM INFORMATION_SCHEMA.PROCESSLIST WHERE COMMAND != 'Binlog Dump' AND COMMAND != 'Binlog Dump GTID';
16:46:34 +ID USER HOST DB COMMAND TIME STATE INFO TIME_MS ROWS_SENT ROWS_EXAMINED
16:46:34 +15 root localhost NULL Query 0 executing SELECT * FROM INFORMATION_SCHEMA.PROCESSLIST 1 0 0
16:46:34 +13 unauthenticated user connecting host NULL Sleep 32 login PLUGIN 31682 0 0
16:46:34 +11 unauthenticated user connecting host NULL Sleep 32 login PLUGIN 31682 0 0
16:46:34 +12 unauthenticated user connecting host NULL Sleep 32 login PLUGIN 31682 0 0
16:46:34 +10 unauthenticated user connecting host NULL Sleep 32 login PLUGIN 31683 0 0
16:46:34 +9 unauthenticated user connecting host NULL Sleep 32 login PLUGIN 31683 0 0
16:46:34 Slave_IO_State
16:46:34 Master_Host 127.0.0.1
16:46:34 Master_User root
16:46:34
16:46:34 mysqltest: Result content mismatch