Fix so that SET PASSWORD is not replicated by the slave if running with

replicate-*-table rules which exclude 'mysql' tables
(e.g. replicate-wild-ignore-table=mysql.%).
This was already the behaviour for GRANT/REVOKE, I'm extending it to
SET PASSWORD because it seems very logical (the contrary seems illogical).
2 new tests:
- one to test if GRANT and SET PASSWORD are replicated
- one to test if they are not replicated if replicate-wild-ignore-table=mysql.%
The 2nd is also a testcase for BUG#980.

mysql-test/r/rpl_do_grant.result

@@ -0,0 +1,26 @@
+slave stop;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+slave start;
+delete from mysql.user where user='rpl_do_grant';
+delete from mysql.db where user='rpl_do_grant';
+flush privileges;
+delete from mysql.user where user='rpl_ignore_grant';
+delete from mysql.db where user='rpl_ignore_grant';
+flush privileges;
+grant select on *.* to rpl_do_grant@localhost;
+grant drop on test.* to rpl_do_grant@localhost;
+show grants for rpl_do_grant@localhost;
+Grants for rpl_do_grant@localhost
+GRANT SELECT ON *.* TO 'rpl_do_grant'@'localhost'
+GRANT DROP ON `test`.* TO 'rpl_do_grant'@'localhost'
+set password for rpl_do_grant@localhost=password("does it work?");
+select password<>'' from mysql.user where user='rpl_do_grant';
+password<>''
+1
+delete from mysql.user where user='rpl_do_grant';
+delete from mysql.db where user='rpl_do_grant';
+flush privileges;
+flush privileges;