notification agent: fix dependency cycle

Fix the loop on ceilometer-agent-notification package.

Change-Id: I8e8663fd51f58d419896aa531d49f8e5fc57cdcd
(cherry picked from commit fe9e463)

Author: Emilien Macchi

manifests/agent/notification.pp

@@ -48,7 +48,6 @@
   Ceilometer_config<||> ~> Service['ceilometer-agent-notification']
 
   Package[$::ceilometer::params::agent_notification_package_name] -> Service['ceilometer-agent-notification']
-  Package[$::ceilometer::params::agent_notification_package_name] -> Package<| title == 'ceilometer-agent-notification' |>
   ensure_packages([$::ceilometer::params::agent_notification_package_name])
 
   if $enabled {