Updated openstack/openstack
Project: openstack/heat  479d65c7900d93e88094c66b0770442663905a79

Handle NotFoundException when deleting alarm

If delete a alarm which has been deleted from ceilometer
already, ceilometer client will throw a exception, and deletion
will fail, so we need to ignore NotFoundException when
deleting alarm.

Change-Id: I224c2de575106d3ce827d48853e0729b6bf9a221