qemu: monitor: Add test validating that 'eventHandlers' are properly sorted

qemu: monitor: Add test validating that 'eventHandlers' are properly sorted

The monitor code uses 'bsearch' to look up the event handler so the
event names must be properly listed. Until now only a comment reminded
us to do it. Add a test to verify that it is actually sorted properly.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>