Comment 1 for bug 1616135

As I can see here:

https://github.com/openstack/fuel-library/blob/a47d71b1fea83100d44f1e33a471d1020d1d94bd/deployment/puppet/openstack_tasks/manifests/heat/heat.pp#L219

in the heat a notification driver setup as constant string (notice that is custom notification driver - heat.openstack.*) without any dependency on the ceilometer.
So, heat always sends notifications and we need to change this behavior:
  if ceilometer is enabled - the notification_driver value must be heat.openstack.common.notifier.rpc_notifier,
  if not - notification_driver must be empty string (means notifications are disabled)