Fix for bug#22662 Inconsistent values displayed for event_scheduler

when set to DISABLED
  
It was a silly ordering number error.



sql/events.h:
  fix ordinal number, the cause for bug #22662
  Inconsistent values displayed for event_scheduler when set to DISABLED
mysql-test/r/events_restart_phase0.result:
  New BitKeeper file ``mysql-test/r/events_restart_phase0.result''
mysql-test/t/events_restart_phase0.log:
  New BitKeeper file ``mysql-test/t/events_restart_phase0.log''
mysql-test/t/events_restart_phase0.result:
  New BitKeeper file ``mysql-test/t/events_restart_phase0.result''

mysql-test/r/events_restart_phase0.result

+SHOW VARIABLES LIKE 'event%';
+Variable_name	Value
+event_scheduler	DISABLED
+SELECT @@global.event_scheduler;
+@@global.event_scheduler
+DISABLED
+SET GLOBAL event_scheduler=on;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=off;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=0;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=1;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=2;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of '2'
+SET GLOBAL event_scheduler=SUSPEND;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of 'SUSPEND'
+SET GLOBAL event_scheduler=SUSPENDED;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of 'SUSPENDED'
+SET GLOBAL event_scheduler=disabled;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of 'disabled'

mysql-test/t/events_restart_phase0.log

+SHOW VARIABLES LIKE 'event%';
+Variable_name	Value
+event_scheduler	DISABLED
+SELECT @@global.event_scheduler;
+@@global.event_scheduler
+DISABLED
+SET GLOBAL event_scheduler=on;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=off;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=0;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=1;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=2;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of '2'
+SET GLOBAL event_scheduler=SUSPEND;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of 'SUSPEND'
+SET GLOBAL event_scheduler=SUSPENDED;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of 'SUSPENDED'
+SET GLOBAL event_scheduler=disabled;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of 'disabled'

mysql-test/t/events_restart_phase0.result

+SHOW VARIABLES LIKE 'event%';
+Variable_name	Value
+event_scheduler	DISABLED
+SELECT @@global.event_scheduler;
+@@global.event_scheduler
+DISABLED
+SET GLOBAL event_scheduler=on;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=off;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=0;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=1;
+ERROR HY000: The MySQL server is running with the --event-scheduler=DISABLED option so it cannot execute this statement
+SET GLOBAL event_scheduler=2;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of '2'
+SET GLOBAL event_scheduler=SUSPEND;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of 'SUSPEND'
+SET GLOBAL event_scheduler=SUSPENDED;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of 'SUSPENDED'
+SET GLOBAL event_scheduler=disabled;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of 'disabled'

sql/events.h

@@ -55,7 +55,7 @@ class Events
   {
     EVENTS_OFF= 0,
     EVENTS_ON= 1,
-    EVENTS_DISABLED= 5
+    EVENTS_DISABLED= 4
   };
 
   static enum_opt_event_scheduler opt_event_scheduler;