Bug#28521 Upgrade from 5.1.17 to 5.1.18 breaks events

 - Add test for upgrading from 5.1.17 - it's a beta but anyway
   good to have a check oif upgrading new system tables for 5.1
 - Always put the "originator" column after "comment" to get correct
  order of columns in "events" table  


scripts/mysql_system_tables_fix.sql:
  Make sure the "originator" column ands up after "comment" to get
  correct order of the columns in event table
mysql-test/t/system_mysql_db_fix50117-master.opt:
  New BitKeeper file ``mysql-test/t/system_mysql_db_fix50117-master.opt''
mysql-test/t/system_mysql_db_fix50117.test:
  New BitKeeper file ``mysql-test/t/system_mysql_db_fix50117.test''

mysql-test/t/system_mysql_db_fix50117-master.opt

+--result-file=system_mysql_db

scripts/mysql_system_tables_fix.sql

@@ -440,7 +440,7 @@ ALTER TABLE event ADD sql_mode
                             'HIGH_NOT_PRECEDENCE'
                             ) DEFAULT '' NOT NULL AFTER on_completion;
 ALTER TABLE event MODIFY name char(64) CHARACTER SET utf8 NOT NULL default '';
-ALTER TABLE event ADD COLUMN originator INT(10) NOT NULL;
+ALTER TABLE event ADD COLUMN originator INT(10) NOT NULL AFTER comment;
 ALTER TABLE event MODIFY COLUMN status ENUM('ENABLED','DISABLED','SLAVESIDE_DISABLED') NOT NULL default 'ENABLED';
 
 ALTER TABLE event ADD COLUMN time_zone char(64) CHARACTER SET latin1