After SST from master node (the one where event is ENABLED) - you will end up with the event enabled on two nodes, hence it's now being executed twice. It can be solved by comparing event's originator with server_id. if not equal, then change its status to 'SLAVESIDE_DISABLED'

Changes to be committed:
	new file:   mysql-test/suite/galera/r/galera_events2.result
	new file:   mysql-test/suite/galera/t/galera_events2.test
	modified:   sql/events.cc