BUG#37733: rpl.rpl_flushlog_loop 'row' fails sporadically on pushbuild

Post-post-push fix. The result file for rpl_rbr_to_sbr needs to be 
updated. While I was there, made rpl_rbr_to_sbr clean up after itself
by reverting @@binlog_format to the value it had before the test
started.

mysql-test/suite/rpl/r/rpl_rbr_to_sbr.result

@@ -4,6 +4,7 @@ reset master;
 reset slave;
 drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
 start slave;
+SET @old_binlog_format= @@global.binlog_format;
 SET BINLOG_FORMAT=MIXED;
 SET GLOBAL BINLOG_FORMAT=MIXED;
 SELECT @@GLOBAL.BINLOG_FORMAT, @@SESSION.BINLOG_FORMAT;
@@ -65,7 +66,6 @@ Last_SQL_Error
 SHOW BINLOG EVENTS;
 Log_name	Pos	Event_type	Server_id	End_log_pos	Info
 slave-bin.000001	#	Format_desc	2	#	Server ver: VERSION, Binlog ver: 4
-slave-bin.000001	#	Query	2	#	use `test`; drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9
 slave-bin.000001	#	Query	1	#	use `test`; CREATE TABLE t1 (a INT, b LONG)
 slave-bin.000001	#	Query	1	#	use `test`; INSERT INTO t1 VALUES (1,1), (2,2)
 slave-bin.000001	#	Query	1	#	use `test`; BEGIN
@@ -73,3 +73,4 @@ slave-bin.000001	#	Table_map	1	#	table_id: # (test.t1)
 slave-bin.000001	#	Write_rows	1	#	table_id: # flags: STMT_END_F
 slave-bin.000001	#	Query	1	#	use `test`; COMMIT
 DROP TABLE IF EXISTS t1;
+SET @@global.binlog_format= @old_binlog_format;

mysql-test/suite/rpl/t/rpl_rbr_to_sbr.test

@@ -5,6 +5,8 @@
 # Test that the slave temporarily switches to ROW when seeing binrow
 # events when it is in STATEMENT or MIXED mode
 
+SET @old_binlog_format= @@global.binlog_format;
+
 SET BINLOG_FORMAT=MIXED;
 SET GLOBAL BINLOG_FORMAT=MIXED;
 SELECT @@GLOBAL.BINLOG_FORMAT, @@SESSION.BINLOG_FORMAT;
@@ -33,6 +35,7 @@ SHOW BINLOG EVENTS;
 
 connection master;
 DROP TABLE IF EXISTS t1;
+SET @@global.binlog_format= @old_binlog_format;
 
 # Let's compare. Note: If they match test will pass, if they do not match
 # the test will show that the diff statement failed and not reject file