Renamed node to initiator in the arguments a monitor calls the script.

Documentation/monitors/MySQL-Monitor.md

@@ -84,7 +84,7 @@ script=/home/user/script.sh
 This script will be called with the following command line arguments.
 
 ```
-<name of the script> --event=<event type> --node=<server whose state changed> --nodelist=<list of all servers>
+<name of the script> --event=<event type> --initiator=<server whose state changed> --nodelist=<list of all servers>
 ```
 Here is a table of all possible event names and their descriptions.
 

server/modules/monitor/monitor_common.c

@@ -295,7 +295,7 @@ void monitor_launch_script(MONITOR* mon,MONITOR_SERVERS* ptr, char* script)
     EXTERNCMD* cmd;
 
     snprintf(argstr,PATH_MAX + MON_ARG_MAX,
-	     "%s --event=%s --node=%s --nodelist=",
+	     "%s --event=%s --initiator=%s --nodelist=",
 	     script,
 	     mon_get_event_name(ptr),
 	     ptr->server->unique_name);