event-alarm: fix the order of alarms in unit test
event-alarm: fix the order of alarms in unit test

'test_continue_following_evaluation_after_exception' might be faild.
It depends on the order of alarms which sorted by id. So this patch
fixs the alarm order by setting ids explicitly.

Change-Id: I6842ee31ad98ba86e5181abbe0075313c4a69496

pczerkas/aodh,pczerkas/aodh,openstack/aodh,openstack/aodh