Fix for crash in mysqld --verbose --help while initializing option

for --init-rpl-role.

Problem: There are two variables involved in this issue,
rpl_status and rpl_role_type. The former is an array containing
the description of the possible values for the latter.

rpl_status is declared as an enumeration and is stored in a 4
bytes integer. On the other hand, my_getopt, reads enum values
into a ulong:

  *(ulong*)value= arg;

This is overwriting the memory used for rpl_role_type, 
corrupting the first entry in the array.

Fix: We fix this by re-declaring rpl_status as a ulong, so that it
has space to accommodate the value "parsed" in my_getopt .

sql/repl_failsafe.cc

@@ -41,7 +41,7 @@
 #define SLAVE_ERRMSG_SIZE (FN_REFLEN+64)
 
 
-RPL_STATUS rpl_status=RPL_NULL;
+ulong rpl_status=RPL_NULL;
 mysql_mutex_t LOCK_rpl_status;
 mysql_cond_t COND_rpl_status;
 HASH slave_list;
@@ -68,7 +68,7 @@ static Slave_log_event* find_slave_event(IO_CACHE* log,
   functions like register_slave()) are working.
 */
 
-void change_rpl_status(RPL_STATUS from_status, RPL_STATUS to_status)
+void change_rpl_status(ulong from_status, ulong to_status)
 {
   mysql_mutex_lock(&LOCK_rpl_status);
   if (rpl_status == from_status || rpl_status == RPL_ANY)

sql/repl_failsafe.h

@@ -26,7 +26,7 @@ typedef enum {RPL_AUTH_MASTER=0,RPL_IDLE_SLAVE,RPL_ACTIVE_SLAVE,
 	      RPL_LOST_SOLDIER,RPL_TROOP_SOLDIER,
 	      RPL_RECOVERY_CAPTAIN,RPL_NULL /* inactive */,
 	      RPL_ANY /* wild card used by change_rpl_status */ } RPL_STATUS;
-extern RPL_STATUS rpl_status;
+extern ulong rpl_status;
 
 extern mysql_mutex_t LOCK_rpl_status;
 extern mysql_cond_t COND_rpl_status;
@@ -34,7 +34,7 @@ extern TYPELIB rpl_role_typelib;
 extern const char* rpl_role_type[], *rpl_status_type[];
 
 pthread_handler_t handle_failsafe_rpl(void *arg);
-void change_rpl_status(RPL_STATUS from_status, RPL_STATUS to_status);
+void change_rpl_status(ulong from_status, ulong to_status);
 int find_recovery_captain(THD* thd, MYSQL* mysql);
 int update_slave_list(MYSQL* mysql, Master_info* mi);