Fix ceilometer notifications in neutron

Also fixes broken logic of passing neutron param to classes:
  openstack::ceilometer
  openstack::horizon

Class openstack::horizon does not seem to use its 'quantum'
parameter at all, but still we should fix it.

Change-Id: Ie78103a760fdd661ebc37b02cb7765453f7e5920
Closes-bug: #1403135