WL#3337 (Event scheduler new architecture)

Remove SHOW SCHEDULER STATUS command and migrate the
information output to `mysqladmin debug` (COM_DEBUG)

SHOW SCHEDULER STATUS was introduced in 5.1.11, provided
some debug information about event scheduler internals and
was enabled only in debug builds.

sql/sql_test.cc

@@ -28,6 +28,8 @@
 #include <sys/malloc.h>
 #endif
 
+#include "events.h"
+
 static const char *lock_descriptions[] =
 {
   "No lock",
@@ -532,5 +534,7 @@ Estimated memory (with thread stack):    %ld\n",
 	 (int) info.keepcost,
 	 (long) (thread_count * thread_stack + info.hblkhd + info.arena));
 #endif
+
+  Events::get_instance()->dump_internal_status();
   puts("");
 }