Test's result update because std_data/words.dat has been lengthened by 500 bytes.

Increased some tests' robustness a bit :
- Added RESET MASTER to all tests who do SHOW BINLOG EVENTS, to make them independent from previous tests.
- Added save_master_pos to these tests to wait for the slave to start before purging its binary logs.

mysql-test/t/rpl_user_variables.test

@@ -3,6 +3,23 @@
 #
 source include/master-slave.inc;
 
+# Clean up old slave's binlogs.
+# The slave is started with --log-slave-updates
+# and this test does SHOW BINLOG EVENTS on the slave's
+# binlog. But previous tests can influence the current test's
+# binlog (e.g. a temporary table in the previous test has not
+# been explicitly deleted, or it has but the slave hasn't had
+# enough time to catch it before STOP SLAVE, 
+# and at the beginning of the current
+# test the slave immediately writes DROP TEMPORARY TABLE this_old_table).
+# We wait for the slave to have written all he wants to the binlog
+# (otherwise RESET MASTER may come too early).
+save_master_pos;
+connection slave;
+sync_with_master;
+reset master;
+connection master;
+
 create table t1(n char(30));
 set @i1:=12345678901234, @i2:=-12345678901234, @i3:=0, @i4:=-1;
 set @s1:='This is a test', @r1:=12.5, @r2:=-12.5;