MDEV-16821 Set password for user makes rpl test to fail

Actually if we use "set password for " command this changes the checksum
of mysql.user table
-localhost      root            Y       Y       Y       Y       Y       Y       Y       Y     YY       Y       Y       Y       Y       Y       Y       Y       Y       Y       Y       Y     $
Y       Y       Y       Y       Y       Y       Y                                       0     00       0                       N       N               0.000000
+localhost      root            Y       Y       Y       Y       Y       Y       Y       Y     YY       Y       Y       Y       Y       Y       Y       Y       Y       Y       Y       Y     Y
Y       Y       Y       Y       Y       Y       Y                                       0     00       0       mysql_native_password           N       N               0.000000
In short we replace '' with mysql_native_password
which make checksum to be different, and hence check test case fails.

So we use UPDATE mysql.user command.

mysql-test/extra/rpl_tests/rpl_row_001.test

@@ -14,7 +14,7 @@ connection slave;
 sync_with_master;
 STOP SLAVE;
 connection master;
-SET PASSWORD FOR root@"localhost" = PASSWORD('foo');
+UPDATE mysql.user SET password=password('foo') WHERE host='localhost' AND user='root';
 connection slave;
 START SLAVE;
 connection master;
@@ -22,7 +22,7 @@ connection master;
 # Give slave time to do at last one failed connect retry
 # This one must be short so that the slave will not stop retrying
 real_sleep 2;
-SET PASSWORD FOR root@"localhost" = PASSWORD('');
+UPDATE mysql.user SET password=password('') WHERE host='localhost' AND user='root';
 # Give slave time to connect (will retry every second)
 sleep 2;
 

mysql-test/suite/rpl/r/rpl_row_001.result

@@ -18,11 +18,11 @@ Ababa
 connection slave;
 STOP SLAVE;
 connection master;
-SET PASSWORD FOR root@"localhost" = PASSWORD('foo');
+UPDATE mysql.user SET password=password('foo') WHERE host='localhost' AND user='root';
 connection slave;
 START SLAVE;
 connection master;
-SET PASSWORD FOR root@"localhost" = PASSWORD('');
+UPDATE mysql.user SET password=password('') WHERE host='localhost' AND user='root';
 CREATE TABLE t3(n INT);
 INSERT INTO t3 VALUES(1),(2);
 connection slave;

mysql-test/suite/rpl/r/rpl_stm_000001.result

@@ -19,11 +19,11 @@ abandons
 connection slave;
 stop slave;
 connection master;
-set password for root@"localhost" = password('foo');
+UPDATE mysql.user SET password=password('foo') WHERE host='localhost' AND user='root';
 connection slave;
 start slave;
 connection master;
-set password for root@"localhost" = password('');
+UPDATE mysql.user SET password=password('') WHERE host='localhost' AND user='root';
 create table t3(n int);
 insert into t3 values(1),(2);
 connection slave;

mysql-test/suite/rpl/t/rpl_stm_000001.test

@@ -19,7 +19,7 @@ select * from t1 limit 10;
 sync_slave_with_master;
 stop slave;
 connection master;
-set password for root@"localhost" = password('foo');
+UPDATE mysql.user SET password=password('foo') WHERE host='localhost' AND user='root';
 connection slave;
 start slave;
 connection master;
@@ -27,7 +27,7 @@ connection master;
 # Give slave time to do at last one failed connect retry
 # This one must be short so that the slave will not stop retrying
 real_sleep 2;
-set password for root@"localhost" = password('');
+UPDATE mysql.user SET password=password('') WHERE host='localhost' AND user='root';
 # Give slave time to connect (will retry every second)
 sleep 2;