KVM Test: Add qmp_event_notification test.

This case test QEMU Monitor Protocol Events.
It just want to make sure that qmp event will be Emitted
When the required conditions are met.
It test following event now:
RESET SHUTDOWN STOP RESUME WATCHDOG.
All test following qmp command:
system_reset, quit, system_powerdown

Signed-off-by: Feng Yang <fyang@redhat.com>
config: Update qmp_event_notification config for rhel4 guest.

rhel4 guest need some special config to make script work.

Signed-off-by: Feng Yang <fyang@redhat.com>