Remove a race between Event Scheduler shutdown and SHOW PROCESSLIST.

This will hopefully fix events.test failure on vmware-win32, 
where scheduling is very primitive.

mysql-test/t/events_scheduling.test

@@ -1,6 +1,5 @@
 # Can't test with embedded server that doesn't support grants
 -- source include/not_embedded.inc
--- source include/not_valgrind.inc
 
 CREATE DATABASE IF NOT EXISTS events_test;
 USE events_test;